二 or 两 or 双 or 对 ?

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"二", "两", "双", "对", all of them have the meaning of 2 or both or pair.

二

this means "2", usually this is used for nouns or name tags.

eg: 二号 number two

两

this also means "2", but this usually has a quantity.

eg: 两百七十三 个 苹果 two hundred and seventy-three apples

双

this means "a pair of", usually this is used for non-living things.

eg: 一双筷子 a pair of chopsticks

对

sometimes this means "a pair of", usually this is used for living things.

eg: 一对情人 a couple