it's a small picture with teeth around it.it has no feet.but it can travel around the word.what

问题描述:

it's a small picture with teeth around it.it has no feet.but it can travel around the word.what

stamp(邮票)

stamp 邮票ll

答案是
stamp(邮票)
翻译如下:
它是一张周围有着牙齿的纸片,它没有脚但却能环游世界,它是什么?