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BNC: 20248 COCA: 14813

ballast

1 ENTRIES FOUND:
ballast /ˈbæləst/ noun
ballast
/ˈbæləst/
noun
Learner's definition of BALLAST
[noncount]
: heavy material (such as rocks or water) that is put on a ship to make it steady or on a balloon to control its height in the air船中保持平衡的压舱物;(热气球的)压载物often used figuratively常用作比喻

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