[00:00.00]喜欢chazidian.com,就把chazidian.com复制到QQ个人资料中!Lesson 55 From the earth: Greetings
[00:07.14]55 来自地球的问候
[00:14.29]Listen to the tape then answer the question below.
[00:17.23]听录音,然后回答以下问题.
[00:20.17]Which life forms are most likely to develop on a distant planet?
[00:27.10]什么生命形式最可能在遥远的行星上得以生存?
[00:34.04]Recent developments in astronomy
[00:36.31]天文学方面的最新发展
[00:38.58]have made it possible to detect planets in our own Milky Way and in other galaxies.
[00:42.41]使我们能够在银河系和其他星系发现行星.
[00:46.24]This is a major achievement because,in relative terms,
[00:49.21]这是一个重要的成就,因为相对来说,
[00:52.19]planets are very small and do not emit light.
[00:54.92]行星很小,而且也不发光.
[00:57.65]Finding planets is proving hard enough,
[01:00.13]寻找行星证明相当困难,
[01:02.62]but finding life on them will prove infinitely more difficult.
[01:05.65]但是要在行星上发现生命会变得无比艰难.
[01:08.68]The first question to answer
[01:10.56]第一个需要解答的问题
[01:12.44]is whether a planet can actually support life.
[01:15.06]是行星是否有能够维持生命的条件.
[01:17.69]In our own solar system,for example,
[01:19.91]举例来说,在我们的太阳系里,