broken-stone ballast是什么意思，broken-stone ballast的翻译，broken-stone ballast音标、读音、用法和例句

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broken-stone ballast是什么意思，broken-stone ballast的翻译，broken-stone ballast音标、读音、用法和例句_伍贰汉英词典

broken-stone ballast

基本解释

专业释义

交通运输工程