I'm very tired.
A:You should work.
B:You should have a rest.
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衣食所安,弗敢专也。( )
滑坡和泥石流在地域上具有( )
某溶液中存在大量的Na+、OH﹣、SO42﹣,该溶液中还可能大量存在的离子是( )