11)We are pleased to send you by parcel post a package containing...

　　很高兴寄你一邮包内装...

　　12)We have the pleasure in acknowledging the receipt of your letter dated...

　　欣获你方...月...日来信.

　　13)We acknowledge with thanks the receipt of your letter of...

　　谢谢你方...月...日来信

　　14)We have duly received your letter of ..

　　刚刚收悉你方...月...日来信.

　　15)We thank you for your letter of ..contents of which have been noted.

　　谢谢你方...月...日来信,内容已悉.

　　16) Refering to your letter of ......we are pleased to ...

　　关于你方...月...日来信,我们很高兴...

　　17) Reverting to your letter of ...we wish to say that...

　　再洽你方...月...日来信,令通知...

　　18)In reply to your letter of ..,we...

　　兹复你方...月...日来函,我方...

　　19) We wish to refer to your letter of ...concerning

　　现复你方...月...日关于...的来信

　　20) In compliance with the request in your letter of ... we...

　　按你方...月...日来函要求,我方...

　　21) In connection with the question of supplying you with ..., we are pleased to say that...

　　关于向你方供应...的问题,欣告你方...

　　22) Further to our letter of ... we are pleased to ..