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题目
Water had also appeared on other planets like Mars but,unlike the earth,it had disappeared later.

提问时间:2021-02-19

答案
but 表示转折,意为但是,然而.这句话中unlike the earth 是插入语,补充说明.Water had also appeared on other planets like Mars but (unlike the earth) it habd disappeared later.可以去掉括号里的内容看句子,unlike the earth 只是起到补充说明的作用.整句:水也曾出现在其他行星上,比如说火星,然而与地球不同的是,其他行星上的水后来消失了.
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