ballast up
动词 v.
英文释义
动词 v.
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To ballast (stabilize or load with a weight) (something, e.g. a ship).
— The ship was ballasted up with sand and rocks.
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To ballast (lay a material on the bed of a railroad track) a track.
— The workers ballasted up the tracks last month.
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数据来源: Wiktionary