第一段词汇解析①detect = discover, find。②in relative terms = relatively (speaking) , in relation to other things。③emit = send out。④ideal conditions = an environment which is perfect (for the development of life)。第二段词汇解析①capable of = able to。②alternatively = on the other hand。③presence = existence。 第三段词汇解析①在 because 引导的原因状语从句中还有一个“ the further…system”作比较状语从句。②小绿人这个单词本身在英语语境中就是指代外星人，是想象的外星小绿人。Notes 学习笔记词组归纳1.Milky Way2.in relative terms3.solar system4.far too5.depend on6.up to7.life forms8.at present9.in existence10.be capable of11.Hubble telescope12.because of13.dust particles14.look for15.outer space16.outer edge17.blot out18.in the first instance19.little green men20.in the realms of sth.21.science fiction
