名词
中文翻译：次级保护层保护
同义词：
['subgrade protection', 'subgrade protection layer']
例句：
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1. Thesubgrade protection measures are designed to prevent soil erosion.
次级保护层措施旨在防止土壤侵蚀。
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2. The subgrade protection layer is crucial for the stability of the roadbed.
次级保护层对于路基的稳定性至关重要。
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3. The construction of the subgrade protection layer is a critical step in the construction process.
次级保护层施工是施工过程中的一个关键环节。