It's a card.There are some picture on it.We can se

问题补充：

Its a card.There are some picture on it.We can send it to your firend from the post office.

答案：

post office.是邮局的意思

所以应该是stamp 邮票

======以下答案可供参考======

供参考答案1:

stamp 邮票

供参考答案2:

stamp