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BNC: 20248 COCA: 14813
ballast
noun [U] /ˈbæləst/
  1. a substance such as water, sand, or metal that is carried in ships or large balloons to help them remain steady 压舱物;压载物
     Synonyms and related words
    Sailing and boating equipment: anchor, ballast, blade...
     Synonyms and related words
    Parts of aircraft: aerofoil, aft, aileron...
BNC: 20248 COCA: 14813
BNC: 20248 COCA: 14813

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