1、haunt 困扰、时时萦绕心头
eg：The question of weather we are alone in the Universe has haunted humanity for centuries, but we may now stand poised on the brink of the answer to the question, as we ...
困扰了好多年，或许答案已经不远了，因为....
2、poised 坦然自若的、自信、体态
3、cog 齿轮
4、wipe out 彻底摧毁、灭绝、了结
5、threat 威胁、恐吓
6、severely 严重地、严格地
7、resemble 与...相像，类似于
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