What kind of postage stamps are issued?

发行了哪种邮票？

Collecting postage stamps is his hobby.

集邮是他的嗜好。

There are beautiful pictures on postage stamps.

邮票上印有美丽的图案；

The glue on Israeli postage stamps is certified kosher.

以色列邮票上的胶水被证实是洁净可食用的。

I promised my mom that I would buy postage stamps today.

我向妈妈做了保证，今天我会买些邮票。