keep [ki:p]vt. (kept, kept, keeping)保持(maintain, retain, sustain)，防止(prevent)，保存(preserve)，经营(manage, run)， 饲养(raise, feed, breed)
keep...from...                 使...免于，使...不能
keep up...                    继续...，坚持...
keep up with...                 跟上...，赶上...
keep ...in mind                 记住...
keep in touch with...             和...保持联系
keep to...                      坚持...， 信守...
keep off...                      避开...，不接近...
keep... to oneself                对...守口如瓶
keep clear of...                  避开...
keep ahead (of...)                保持(对...的)领先地位
e.g. i'll only keep you a few minutes.
key [ki:]n. 钥匙，答案(answer, solution)，键
the key for the door                 门的钥匙
the key to a problem                问题的答案
e.g. he is a key witness目击者，证人 in this case.案例
 
kick [kik]  v. /n. 踢
kick a goal                            踢进一球
kick about(=kick around)                反抗,厌恶
e.g. don't kick the ball into the road.
 
kid [kid] n. 小孩(child)
e.g. he's still a kid, in training.
 
kill [kil]v. 杀死，毁掉(destroy)
kill time                                 消磨时间
kill two birds with one stone                 一箭双雕
e.g. his wife was killed in a car accident.
 
kind [kaind]  n. 种类(sort, type, category)adj. 仁慈的，和蔼的(nice， friendly)
kind of                                  有点儿，有几分
a kind of...                                一种（的）...
all kinds of...                              各种各样（的）...
e.g. we often do this kind of exercise.
 
knife [naif] n. 刀，小刀
e.g. i picked up the knife and threw it out of the window.
 
know [nəu]v. (knew, known, knowing)知道(be familiar with, be aware of)，了解(understand, realize)，掌握...的知识(grasp)
be known as...                               作为...而出名
be known for...                               因...而出名
get to know...                                逐渐了解...
know about...                                知道...，了解...
know sth. [sb. ] from...                         把...和...区别开
e.g. i just don't know what to say.
 
knowledge n. 知识(learning)，认识，知道
have a knowledge of ...                           对...很了解
to one’s knowledge                              据...所知
acquire/obtain/gain a knowledge of...                学到...的知识

lab [læb] (= laboratory)n. 实验室
fridge – refrigerator
phone – telephone
flu - influenza
language lab                           n. 语言实验室， 语音室
lack[læk] v. 缺乏(be short of)n. 缺乏(absence, shortage)，没有
lack of ...                                      ...的缺少
for lack of...                                    因缺乏...
e.g. he is lack of passion热情 in work.
 
lag[læg] n./vi.(lagged, lagged, lagging) 落后(drop behind, get behind)
lag behind ...                                   落在...的后面
e.g. the children always lag behind when we go for a walk.
 
land [lænd]  n. 陆地(earth)，土地(soil)， 国土v. (使)登陆
land transportation                              陆上运输
forest land                                      林地
e.g. we are glad to be on land again.
 
language  n. 语言(tongue)
an official language                              官方语言
spoken [oral] language                            口语
written language                                  书面语言
e.g. chinese is my native language.
 
laugh  vi./n. 笑
laugh at...                                      嘲笑...
laugh... off                                     用笑摆脱...
laugh in sb.'s face                              当面嘲笑某人
laughter ['lɑ:ftə] n. 笑, 笑声
e.g. don't laugh at him     laughter is the best medicine.
 
launch vt.发射(导弹、火箭等)(send off, set off)，发起(begin, initiate, set up, start )n. 发射
launch an artificial satellite                     发射人造卫星
e.g. they have launched a man-made satellite successfully.
 
law n. 法律，规律(rule, principle)                  
observe/keep/follow a law                                 守法
enforce a law                                             执法
the laws of nature                                         自然规律
e.g. i have to follow nature's law.
 
lay [lei]vt.(laid, laid, laying) 放置(put, place)，铺设，布置，产(卵)
lay... off                                        (临时)解雇...
lay... aside                                       搁置..., 积蓄...
lay down...                                        制定...，放下...
lay out                                            布置, 展示
e.g. we shall have to dig挖under the river to lay the sewage 污水pipe.管道
 
lead [li:d]  v.(led, led, leading) 领导(guide, direct, head, preside over, supervise)，(道路等)通向，导致n. 铅， 领导
lead sb. in doing...                              领导某人做...
lead a ... life                                   过...生活
lead to...                                        导致..., 通向...
take the lead                                     带头
e.g. the guide向导led us to the river.
 
leader ['li:də] n. 领袖，领导者
e.g. he's a follower, not a leader.
 
leadership  n. 领导能力
under the leadership of...                       在...的领导之下
e.g. he shows quality才能 of leadership.
 
learn [lə:n]v. (learnt/learned, learnt/learned, learning)学习(study)，学会(acquire, grasp, master)，得知(know)， 记住(bear in mind, memorize)
learn ...by heart                                记住...
learn from...                                    向...学习
learn of/about...                                得知...， 了解...
e.g. one is never too old to learn.   活到老，学到老。
 
leave[li:v]v. (left, left, leaving)离开(depart, go away, set off)，留下， 使处于（某种状态）n.假期
leave for...                                     出发前往...
leave ...alone                                   不管...
leave... behind                                  遗留..., 超过...
leave ...out                                     省去..., 遗漏...
ask for leave                                     请假
e.g. what time does the ship leave?
 
lecture   n./v. 演讲(speech, address)，讲课
attend a lecture                                   听报告，上课
deliver [give] a lecture                           讲课，讲演
e.g. his long lecture made us yawn.打瞌睡
 
lend [lend]v. (lent, lent, lending)借给(loan)，贷(款)/ borrow
lend sth to sb                                   把某物借给某人
lend a hand in...                                帮忙..., 参加...
lend itself to...                                 有助于...
e.g. can you lend me money? no way.
 
lesson ['lesn]n. (一节)课(class, lecture)，课程，教训(example, moral)
 (be) a lesson to sb.                           对某人来说是一个教训
teach sb. a lesson                            教训某人
e.g. his car accident has been a lesson to him to stop driving too fast.
 
let [let]v. (let, let, letting)允许(allow, permit, agree to)， 让，出租(rent, lease)
let alone...                                 更不用说...
let down...                                  放下..., 使失望...
let... off                                   放（炮， 烟火等）， 开（枪）      
let...out                                    放掉..., 泄露...
e.g. i let him go home.
 
letter ['letə]  n. 文字，字母，信函
by letter                                        以书信形式
post a letter                                    寄一封信
e.g. this word has five letters.
 
level ['levl] n. 水平，水平面，等级(grade, standard)adj. 水平的(flat, even，horizontal)
level of living                                 生活水平
e.g. we must increase production levels.
 
liberate['libəreit] v. 解放(set free), 释放(release)
e.g. our army had liberated many occupied占领的 areas.
 
life [laif] n. 生命，寿命，生活， 生物(creature)
bring...to life                                使恢复，给...以活力
come to life                                  苏醒过来
for life(= all one’s life)                   一生，终生
life-span                                     寿命
life belt                                     安全带
life condition                                生存［生活］条件
lead/live a ...life                           过一种...的生活
life style                                    生活方式
e.g. you'll never see life if you stay at home forever.

lift [lift] v.提高(raise, elevate, pick up)，（尤指云， 雾）消散(disappear, vanish)n. 举起, 电梯(elevator), 搭车
give sb. a lift                                   让某人搭便车
lift a finger                             [通常用于否定句]出一点儿力
lift the ban on...                                (对...)解禁
lift ... up                                        把...提起来
e.g. he's too weak to lift the box.
 
like  vt. 喜欢(enjoy, love, prefer, be fond of, be interested in, delight in, appreciate)，希望(wish, expect)prep. 像，如同 adj. 相像的(alike)
would like to do                                 想要...
feel like doing                                  想要...
lf you like                                      如果你愿意的话
e.g. it sounds like you enjoyed it.
 
limit['limit] vt.限制, 限定(confine, restrict)n. 界限, 限度(restriction)
set a limit to...                               对...加以限制
limit sb. to (doing) sth.                      限制某人（做）某事
e.g. please limit your shower淋浴 time.
 
 
line n. 线(thread, string), 路线(path, route, way), 电线(electrical wire)，(文章)行vt. 排成一行
be in line with...                           和...一致， 与...符合
line up (for...)                             排队(等候...)
wait in line(for...)                        排队等候（...）
be on line                                 （计算机）在线
e.g. hang the clothes on the line.
 
 
link [liŋk]vt.连结(join, connect, unite)，联系n. 链环，连结物
link up                                          联接，结合
e.g.    is there a link between smoking and lung disease?
 
 
list [list] n. 目录(catalog), 名单, 列表(schedule)vt. 列出
make a list of...                             列出...的清单
e.g. this is our latest price list.
 
 
listen['lisn]   vi. 听，听从
listen to ...                               听...， 听从...
e.g. you must all listen carefully.
 
literature n. 文学(作品), 文献
literature search                          文献调查, 文献研究
e.g. literature is a mirror镜子 of its time.
 
live  v. 活着，生活(exist)，居住(dwell, reside)adj.活的，实况转播的
live a ...life                      过...生活
live with...                         和...同居，忍受
live for...                           为...而生活
live by...                           靠...生活
live on/upon...                      靠...生存，以...为食
e.g. did you live with your parents?
 
liver n. 肝脏
liver cancer                             肝癌
liver failure                           [医]肝功能衰竭
liver function                           肝功能
e.g. the doctor says it's just a touch of liver.
 
living['liviŋ]n. 生活(existence, life)，生计adj. 活的，现存的
 (alive, live, existing, surviving)
make one’s living by...                靠...谋生
living conditions                       生活的境况
living room                             客厅，起居室
living cost                              生活费用
living resources                         生活资源
e.g. dying is as natural as living.
 
load [ləud] n. 负荷(burden), 工作量vt. 装载(fill), 使担负(burden)
a load of...                          大量的
e.g. the boat received a heavy load.
 
loan [ləun]  n. (借出的)贷款，借出v. 借，借给(lend)
比较 borrow ,lend/loan
borrow 借入
我从他那里借了100美元
e.g. i borrowed $100 from/of him.
loan/lend
他借给我100美元。
e.g. he loaned/lent me $100.
 
locate [ləu'keit] vt. 把...设置在(establish, found, build)，使...坐落于，找到(discover, find)
be located in...                             坐落于...， 位于...
locating device                             定位装置
e.g. locate the place on this map.
 
location n. 位置(place, position, situation), 场所(site)
e.g. the town is a good location for a young doctor.
 
look [luk]vi. 看，看起来好象(seem, appear)n. 看，面容(face)，外表(appearance)
look at...                                 看...
look after...                              照料...
look for...                                 寻找...
look forward to...                          盼望...，期待...
look into...                                调查..., 观察...
look up...                                  查阅...
look up to...                               尊敬...
look over ...                               察看...， 检查...
look down on...                             轻视...，看不起...
 
e.g. he looks nervous.
 
 
lose [lu:z]vt. (lost, lost, losing)遗失(miss)，失去，使迷路，输掉(fail, get beaten)
lose weight                               减轻体重，减肥
lose one’s way                           迷路
lose one’s courage                       丧失勇气
lose interest (in...)                     失去（对...的）兴趣
lose patience                             失去耐心
e.g. i lost my wallet 钱包yesterday.
 
loss  n. 损失(damage)，遗失，失败(failure, defeat)
at a loss                                亏本，不知所措
e.g. the loss of her purse钱包 caused her much inconvenience.不便
 
lot  n. 许多， adv 相当
lots and lots of...                     许许多多的，大量的
a lot of...                             非常多的...
a lot                                   非常
e.g. they drew lots to decide which of them should go first.
 
love   n. 热爱(passion)，爱情(affection)，爱好vt. 爱(like, care for, have a passion for, treasure)，爱好(enjoy)
first love                                初恋
fall in love with...                     爱上...
love at first sight                       一见钟情
e.g. i love my motherland.祖国
 
luck  n. 运气，幸运(chance, fortune)
in luck                                    运气好
out of luck                              运气不好
e.g. dare勇敢，大胆 and diligence 勤奋bring luck.
 
lung  n. 肺
lung cancer                                    肺癌
e.g. smoking can cause lung cancer.