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BNC: 20248 COCA: 14813

heavy matter such as sand or stone that is used at the bottom of a ship or a hot-air balloon to make it heavier, or the small stones on which railways and roads are made(船的)压舱物;(气球的)镇重物;(用作路基的)道砟,石碴

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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