Ballast Aggregate(石碴), 此释义来源于网络辞典。
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... ballast (for trackbed) 碎石 ballast aggregate 碎石骨料 ballast arrangement 压舱物配置 ...
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ballast aggregate dam 石碴坝
These are used for building or are broken down for use as an aggregate for concrete or as ballast chippings.
砖材用于建造房屋，或将其破碎作为混凝土骨料和铺道渣。
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