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Telephone introduction: In the corners of some concubine's rooms, there are often telephones. This kind of communication equipment is divided into two floors, with a receiver and microphone on the ground and a bell on the bottom. Hu Xueyan had 13 wives. In order to facilitate meetings with his wives and avoid jealousy among them, he specially asked foreigners to install the most advanced telephone facilities in the West at that time in his house. Telephones were transmitted through copper pipes and did not use electricity. At that time, they were only available on warships or large cruise ships. Hu Xueyan installed this in a private house, which was also the first in the country.