名词中文翻译
中文翻译：次级地层
同义词：
['sub-grade', 'substratum例句：1. The subgrade is being excavated for the new road construction.（正在为新道路建设挖掘次级地层。）']
例句：
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1. The subgrade is being excavated for the new road construction.
正在为新道路建设挖掘次级地层。
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2.The subgrade must be compacted to ensure stability during construction.
次级地层必须压实以确保施工期间的稳定性。
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3.The subgrade is an important part of the foundation for the building.
次级地层是建筑物基础的重要组成部分。