名词
中文翻译：小费
同义词：
['tip', 'extra charge', 'additional expense']
例句：
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1.The waiter gave me a tip of $20.
服务员给了我20美元的小费。
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2. The restaurant offered a free dessert as a tip.
餐厅作为小费免费提供了一道甜点。
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3. The customer left an additional $50 for the service.
顾客留下了额外的50美元作为小费。