Would you please weigh this for me? I'd like to send it by airmail. 请帮我称一下这个邮件好吗？

　　It's 2.3 dollars. Here are the stamps and sticker, be sure to paste these stamps and an "Air Mail" sticker on the envelope. 共2.3美元，这儿有邮票和贴纸，务必把这些邮票和那张有“航空有机”的贴纸贴在信封上。

　　Your letter is overweight. 你这封信超重了。

　　Your letter is overweight. You must pay extra for it. 你这封信超重了，你必须额外付钱。

　　How much do I have to pay? 我需要付多少？

　　40 cents for it. 40美分。