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【英语时差8,16】光速与星际高速公路-上

时间:2016-03-29 02:13来源:互联网 提供网友:yajing   字体: [ ]
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If you’re driving on an interstate highway, the only thing keeping you from going faster than the speed limit is your sense of civic1 duty, or perhaps that police car up ahead. There’s one speed limit, however, that most scientists agree nothing will ever break. That’s the speed of light: 186,280 miles per second. As it travels through deep space, light moves at exactly this speed, no more and no less. The speed of light is so reliable2, we even use it to measure distances between the stars. If it takes starlight fifty years to reach us, we say that this star is fifty light-years away. You might be surprised to learn, however, that light itself does not always travel at the speed of light. Our interstate highways generally have a higher speed limit, but once you enter a city or residential3 street, the speed limit lowers4.

 

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1 civic Fqczn     
adj.城市的,都市的,市民的,公民的
参考例句:
  • I feel it is my civic duty to vote.我认为投票选举是我作为公民的义务。
  • The civic leaders helped to forward the project.市政府领导者协助促进工程的进展。
2 reliable 6Vlxe     
adj.可信赖的;可靠的
参考例句:
  • I'm afraid the information is not reliable.恐怕消息不可靠。
  • Do you think she's reliable?你看她这个人可靠吗?
3 residential kkrzY3     
adj.提供住宿的;居住的;住宅的
参考例句:
  • The mayor inspected the residential section of the city.市长视察了该市的住宅区。
  • The residential blocks were integrated with the rest of the college.住宿区与学院其他部分结合在了一起。
4 lowers fc5978a00740405615a90c53fd8b6432     
v.(使)降低, (使)跌落( lower的第三人称单数 );削弱;削减;减少
参考例句:
  • The reduction in white blood cell counts lowers resistance to disease. 白细胞总数的减少,会降低对疾病的抵抗力。 来自《简明英汉词典》
  • The sun lowers in the west. 太阳从西边落下。 来自《简明英汉词典》
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