名词
中文翻译：回扣
同义词：
['rebate', 'discount', 'refund']
例句：
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1. The company offered a 10% back charge on all purchases.
公司对所有购买提供10%的回扣。
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2. The customer was charged an extra $50 for the extra service.
客户因额外服务被收取了额外的50美元。
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3. The manager decided to give back some of the profits to the employees as a reward.
经理决定将部分利润作为奖励返还给员工。