名词中文翻译1
中文翻译：Unknown
同义词：
['base', 'foundation', 'lower stratum例句：1. The subgrade is being compacted to improve drainage.（正在对下卧层进行压实以改善排水。）']
例句：
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1. The subgrade is being compacted to improve drainage.
正在对下卧层进行压实以改善排水。
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2.The foundation of the building is made of reinforced concrete.
这栋建筑的地基是用钢筋混凝土做的。
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3. The lower stratum is rich in minerals that are not found in the upper stratum.
下层富含上层不含有的矿物质。