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BNC: 20248 COCA: 14813
ballast
bæləst ˈbæləst
N-UNCOUNT 压舱物;镇重物 Ballast is any substance that is used in ships or hot-air balloons to make them heavier and more stable. Ballast usually consists of water, sand, or iron. 压舱物;镇重物
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BNC: 20248 COCA: 14813
BNC: 20248 COCA: 14813
BNC: 20248 COCA: 14813
ballast
Sailing and boating equipment: anchor, ballast, blade...
Parts of aircraft: aerofoil, aft, aileron...

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