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。
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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