Do you want it insured? 你的邮件要保险吗？

You should insure your packages against loss and damage. 

你的邮包应该要保险，以免遗失或损坏。

What are the insurance rates? 保险费率是多少？

That all depends on the value. 那得视价值而定。

The insurance is 50 cents. 保险费是50美分。

How much do I need for these letters? 寄这些信要多少钱？

That comes to 15 dollars, please. 一共是15美元。

You should buy a 20-cent stamp. 你应该买一张20美分的邮票。

Can I send these books as printed matter? 这些书我可以以印刷品邮寄吗？

It’s printed matter.  这是印刷品。

This rate for printed matter is cheaper. 印刷品的邮资比较便宜。