名词
中文翻译：硬地层
同义词：
['hard crust', 'hard shell']
例句：
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1. Thehardpan is a layer of rock thathas been eroded away by water.
硬地层是一层被水侵蚀掉的岩石。
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2. The hardpan is animportant geological feature that can be usedto study the history of the earth's crust.
硬地层是一个重要的地质特征，可以用来研究地球地壳的历史。
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3.The hardpan is a layer of rockthat has been eroded away bywind and water.
硬地层是一层被风和水侵蚀掉的岩石。