译：People are fearful of the huge threat posed by the greenhouse effect on the environment .
2. 在大城市里生活一段时间后，他发现自己已经很难再适应乡村生活了。（be conditioned to）
译：After living in a big city for a while ,he found that it was hard for him to become conditioned to rural life again .
3. 他渐渐意识到没有人能够对这件事做出一个令人信服的解释。（dawn on sb ;come up with）
译：It gradually dawned on him that no one would come up with a convincing explanation of this incident .
4. 人们想当然地认为苦干有助于成功。（take for granted ;contribute to）
译：It is taken for granted that hard work contributes to success .
5 他总是找理由逃避集体活动。（walk away from ;collective） 译：He is finding excuses to walk away from collective activities .
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