门槛是门扉的下端的一根横著的东西，常见的有木制、石制、铜制门槛。现今城市高层住宅楼里的房间大多没有了门槛，一些地方的农村住宅和老房子依然留有门槛。在中国古代，门槛是权力和地位的象征，家里的门槛越高，说明主人身份越尊贵[1]。
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