The "doorbell" was rarely heard in ancient China. The rich and rich families installed decorative knockers on their doors. The knockers could beat the nails under the knockers to make a loud sound, which had the function of a modern "doorbell".The "doorbell" often appears in the ancient films of foreign films, and most of them are rich people who hang a huge bronze handle in front of the door.When the coachman delivers the guest to the door, he will pull the bell in the way to show the visitor.In modern times, "doorbell" is no longer a special item for rich people, but has been widely used by ordinary people.A variety of "doorbells" can be found everywhere, and the role of "doorbells" is not limited to calling guests.
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