名词
中文翻译：地层
同义词：
['stratum', 'sedimentary rock layer例句：1. The geologist studied the tundrite layers in the area to understand the history of the land.（地质学家研究该地区的地层以了解土地的历史。）']
例句：
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1. The geologist studied the tundrite layers in the area to understand the history of the land.
地质学家研究该地区的地层以了解土地的历史。
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2. The tundrite layers are rich in minerals and can be used for building materials.
这些地层富含矿物，可用于建筑材料。
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3. The tundrite layers were formed millions of years ago when the earth was still molten.
这些地层是在数百万年前形成的，当时地球仍然处于熔融状态。