chappa

例句：

1. 1.When we arrived at the restaurant, I gave him a $20 tip.
   我们到达餐厅时，我给了他20美元的小费。
2. 2. The waiter asked for a $50 gratuity when they served us.
   服务员在我们用餐时要求我们支付50美元的小费。
3. 3.It's customary to tip your server a small amount of money in most restaurants.
   在大多数餐厅，给服务员小费是一种习惯。