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BNC: 14487 COCA: 8144

booster noun [ C ] IMPROVEMENT

something that improves or increases something促进提高的事物;起推动作用的事物

a confidence/morale booster对信心/士气的激励

booster noun [ C ] ENGINE

an engine on a spacecraft that gives extra power for the first part of a flight(航天器的)推进器

a rocket booster火箭推进器

booster noun [ C ] DRUG

a small amount of a substance that is given to increase the effect of the same substance given some time before, to continue to protect a person from illness(增强药效的)辅助药剂

a polio booster小儿麻痹症辅助药剂

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