There is a small picture. With many teeth on its sides. It is a friend of a letter. letterWith it,a goes all over the world .what is it?

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There is a small picture. With many teeth on its sides. It is a friend of a letter. letterWith it,a goes all over the world .what is it?
There is a small picture. With many teeth on its sides. It is a friend of a letter. letter
With it,a goes all over the world .what is it?

There is a small picture. With many teeth on its sides. It is a friend of a letter. letterWith it,a goes all over the world .what is it?
A stamp.(邮票)

stamp