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Quite a few people have to believe something is normal before it becomes normal - a sort of 'voting' situation. But once the threshold is reached, then everyone demands to do whatever it is.
相当多的人在事情变得正常之前必须相信它是正常的——一种“投票”的情况。但是一旦门槛达到，每个人都要求做任何事情。