culvert on steep grade是什么意思，culvert on steep grade的翻译，culvert on steep grade音标、读音、用法和例句

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culvert on steep grade是什么意思，culvert on steep grade的翻译，culvert on steep grade音标、读音、用法和例句_淳朴汉英词典

culvert on steep grade

基本解释

专业释义

交通运输工程