名词
中文翻译：下坡道
同义词：
['subgrade', 'subgrade surface', 'subgrade level例句：1. The subgrade of the road is uneven and needs to be improved.（这条路的下坡面不平整，需要改善。）2. The subgrade was damaged during the heavy rain.（大雨期间，下坡面受损了。）']
例句：
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1. The subgrade of the road is uneven and needs to be improved.
这条路的下坡面不平整，需要改善。
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2. The subgrade was damaged during the heavy rain.
大雨期间，下坡面受损了。
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3.The subgrade is a crucial part of the road system.
下坡面是道路系统的关键部分。