Tea intake was assessed by questionnaire, once at the beginning of the study and then again five years later.
通过问卷调查估计茶摄入量,一次在研究开始时,再一次在5年后。
Suppose the planet were hit by a comet-- this happened--something like this happened sixty-five million years ago, so it could happen again.
假设这个星球被一颗彗星击中-,这样的事,大约六千五百万年前,发生过,所以它还可能再发生。
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