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1.bill n.纸币，账单
pay my bill with bill of small denomination 用小面值纸币来付账单。
2.mail n.& vt.邮递，邮送
E-mail 电子邮件
post office 邮局
3.extention n.延期；分支
apply for extention of paying for the bill
申请账单延期支付
4.prove vt.证明，检验，显示
-I dare say...
-Don't say it. Prove it!
-我敢说……
-别说，证明给我看！
