1、翻译划线句子
09年理工类C级考题
Light Night, Dark Stars
1 Thousands of people数以千计around围绕 the globe地球 step步行行走 outside 外面to gaze at 凝视their night sky.夜晚的天空 On a clear night, with no clouds, moonlight, or artificial lights to block the view,2 people can see more than 14,000 stars in the sky, says Dennis Ward, an astronomer (天文学家) with the University Corporation for Atmospheric Research (UCAR) in Boulder, Colo. But when people are surrounded by city lights, he says,3 they're lucky幸运的 to see 150 stars.
4 If you've ever曾经driven toward朝，向 a big city at night and seen its glow 发光from a great distance从远处, you've witnessed见证，目击 light光 pollution污染, 5 it occurs发生 when light from streetlights路灯, office buildings办公楼, signs标志, and other sources来源 streams流动流入 into space and illuminates (照亮) the night sky. 6 This haze (朦胧) of light makes many stars invisible 不可见to people on Earth. Even at night, big cities like New York glow from light pollution, making stargazing difficult.
7 Dust灰尘 and particles微粒 of pollution污染 from factories 工厂and industries 工业worsen使变得更坏 the effects 影响of light pollution. "If one city has a lot more light pollution than another," Ward says, "that city will suffer the effects of light pollution on a much greater scale."8 Hazy朦胧的 skies also make it far more difficult for astronomers to do their jobs.
9 Cities are getting larger. Suburbs are growing in once dark, rural areas. Light from all this new development is increasingly obscuring (使变模糊) the faint (微弱的) light given off by distant stars. And if scientists can't locate these objects, they can't learn more about them.
10 Light pollution doesn't only仅仅 affect star visibility能见度. It can harm 伤害wildlife野生动物 too. It's clear that artificial light can attract animals, making them go off course. There's increasing evidence, for example, that migrating (迁徙) birds use sunsets and sunrises to help find their way, says Sydney Gauthreaux Jr., a scientist at Clemson University in South Carolina. "When light occurs at night," he says, "it has a very disruptive (破坏性的) influence." Sometimes birds fly into lighted towers, high-rises, and cables from radio and television towers. Experts estimate that millions of birds die this way every year.
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