help oneself 自用,自取
keep an eye on 留意,照看
keep in mind 记住
keep one's head 保持镇静
keep one's word 守信用
keep pace(with) (与……)齐步前进
lead the way 引路,带路
learn by heart 记住,背诵
leave alone 不打扰,不干预
let alone 更别提,不打扰
let go (of) 放,松手
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