Tips are generally not required at cafeterias where you serve yourself and you are expected to clear your own table of dishes and utensils, and discard your trash in the garbage cans.

【参考答案】

由于在自助餐厅人们自己为自己服务，并且，吃完饭后还要自己清理掉桌子上的饭菜和餐具，自己把垃圾倒进垃圾箱里，所以，自助餐厅......

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