either…or one or the other of the two或…或；不是…就是*Please either come in or go out．Don't stand there in the doorway．要么进来要么出去，不要站在门口。*He must be either mad or drunk．他不是疯了，就是喝醉了。
either... or...
eg
Editorials would demand that he either recant or retire from public life.
社论会提出要求，他若不是宣布放弃信仰，就是从公共生活中隐退。
neither... nor...
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