An airmail letter to china normally cost50 cents, but this letter seem a bit thick.
寄往中国的航空信一般是50美分,不过这封信好像厚一点。
Thank you for your letter of May10,1992 inquiring about the warranty on our products exported.
感谢你方1992年5月10日来函,询问我公司对出口商品的保证问题。
I'd like to draw100 yuan against this letter of credit.
我想从这份信用证上提款100元。