名词
中文翻译：沙层
同义词：
['sand layer', 'sandylayer']
例句：
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1. The constructioncrew was working on the foundation of thenew building.
建筑工人正在为新大楼的基础工作。
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2. The sand layer is very softand easy to compact.
沙层非常软，容易压实。
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3. The sand layer is agood indicator of the depth of the underlyingrock.
沙层是判断地下岩石深度的良好指标。