The answer to double happiness is "Chongqing". In Chinese, "heavy" and "double" have the same meaning. If there is a happy event, it is natural to celebrate it, which is "celebration". Double happiness at the door, to celebrate twice, is "Chongqing", so the answer is "Chongqing".

As for the origin of Chongqing's place names, Sichuan Tongzhi in Qing Dynasty recorded that it was named because it was between Shaoqing and Shunqing, which meant that it was located between Shao Qing and Shunqing, so it was named "Chongqing". It is also said that in 1 189, Chongqing was upgraded from a "mansion" and felt that it was a double happiness.

Double happiness is an idiom in China, which means two happy events come together. This idiom comes from strange situations witnessed in the past 20 years. Its synonym is Joy, and its antonym is It never rains but it pours.