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客人来到一家餐厅,要了一杯咖啡,当喝到一半时又兑满了开水;又喝去一半时,再次兑满了开水;又经过同样的两次兑水过程,咖
Guests came to a restaurant, got a cup of coffee, half-filled with boiled water, half-filled with boiled water, and the same two watered-in processes