名词中文翻译
中文翻译：副级
同义词：
['subordinate', 'lower grade', 'subordinate level']
例句：
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1. The subgradeis the foundation of the roadbed.
路基是道路的基础。
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2. The subgrade must be compacted to ensure stability.
必须压实下一级以确保稳定性。
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3. The subgrade was designed to withstand heavy traffic.
下一级被设计来承受重交通。