名词中文翻译
中文翻译：副级
同义词：
['subordinate', 'subordination']
例句：
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1.The subgrade is being compacted to prepare for the next layer.
正在对下层进行压实以准备下一层。
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2. The subgrade must be designed to withstand heavy traffic.
下层必须设计成能承受重交通。
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3.The subgrade was constructed using a mixture of crushed stone and gravel.
下层是用碎石和砾石混合而成的。