星级典句:
第一句: I'd like to send a letter by registered mail.
我想寄挂号信。
A: Can I help you?
您要办什么业务？
B: I'd like to send a letter by registered mail.
我想寄封挂号信。

第二句: I want to mail this parcel to China by airmail.
我想空寄这个包裹到中国。
A: I want to mail this parcel to China by airmail.
我想空寄这个包裹到中国。
B: Do you want it insured?
您要给他上保险吗？
A: What's the insurance fee?
保险费是多少？
B: The insurance fee is 20 dollars.
20美元。

其他表达法:
By ordinary airmail, please.
请用普通航空信封。
I want to send an express telegram.
我想发一封急报。