每个月，我都会收到水电费、取暖费的账单，因此我很快学会了需要多少就用多少。
Every month I got a bill for electricity, heat, and water, so I quickly learned to use only what I needed.
我在买单的时候，问侍者那对夫妇的账单是多少钱，他告诉了我，然后我替他们付了40美元。
As I paid my bill, I inquired as to what their bill was, he informed me, and I gave him the $40 to pay their tab[2].
但是，他不知道，我付了房租和其他账单后就不剩多少钱了。
But he doesn't realize I don't have much money left after I pay the rent and all the other bills.
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