In the front, this article was written by me and a few foreign friends, and it was also a whim. When chatting, everyone decided to write an article in a row rather than writing one together. Then the friends each modified the content into an article that suits their cultural customs and customs. The original text is in English, so you may see similar versions of various texts or countries. That is our work. I personally responsible for the Chinese version. Because it is written together and translated by one person, there will be no problem of style gap. Please enjoy it with peace of mind.