嗯。而且这样也可以控制服务的质量。有了小费这个环节，服务员就不敢消极怠工了。
ng 。érqiě zhèyàng yě kěyǐ kòngzhì fúwù de zhìliàng 。yǒu le xiǎofèi zhè gè huánjié ，fúwùyuán jiù bù gǎn xiāojí dàigōng le 。
Yeah. And this way you can also control service quality. By having tips you make this connection, so waiters don't dare to slack off.