Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit-card logo.
对餐馆的研究表明，当账单被放在印有信用卡标志的托盘上时，用现金付账的顾客往往会留下更多的小费。
2
It is important to pay your electricity bill on time, as late payments may affect your credit.
及时缴纳电费很重要，因为迟交可能会影响你的信誉。
3
If someone added an extra bill to the envelope, which contained your credit card bill, he has violated the integrity of the mail.