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单词 continental rock
例句
原声例句
万物简史

None had ever been found to be older than about 175 million years, which was a puzzle because continental rocks were often billions of years old.

人们发现,那里的海底年龄都不超过1.75亿年。这是个谜,因为大陆上的岩石年龄往往有几十亿年。

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