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BNC: 20248 COCA: 14813

ballast

Related topics: Water, Air, Roads
bal·last /ˈbæləst/ noun [uncountableU]  
1. TTWheavy material that is carried by a ship to make it more steady in the water 〔使船只保持平稳的〕压舱物
2. TTAmaterial such as sand that is carried in a balloon so that it can be thrown out to make it rise 〔用于控制热气球高度的〕沙囊,压载物
3. TTRa layer of broken stones that a road or railway line is built on 〔道路或铁路铺路基用的〕道砟,石碴
Examples from the Corpus
Origin ballast
(1500-1600) Probably from Low German
bal·last noun
Chinese
Syllable
Corpus

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