名词
中文翻译：地壳层
同义词：
['strata', 'crust', 'mantle']
例句：
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1.The geologist is studying the stratum of rocks beneath the mountain.
地质学家正在研究这座山下面的岩石地层。
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2.The mineral deposits are found in different strata of the earth's crust.
矿藏分布在地球地壳的不同层次中。
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3.The scientists believe that the stratum of the ocean floor is a key to understanding the Earth's history.
科学家们认为海洋底部的地层是理解地球历史的关键。