chape

例句：

1. 1.He gave me a tip of $20 as a gesture of goodwill.
   他给了我一个小费，作为友好表示。
2. 2. The waiter added a gratuity to the bill for the extra service.
   服务员在账单上加了一个额外的小费以提供额外服务。
3. 3. It's customary to tip your server at restaurants in the US.
   在美国的餐厅，给服务员小费是惯例。