Some states are larger than others, but in theory, all sovereign states are equal under international law, as lawyers would say, states have legal personality so they can sign treaties and do other things.
有些國家比其他國家大,但在理論上,所有主權國家在國際法下都是平等的,正如律師所說,國家有法律人格,所以他們可以簽署條約和做其他事情。