Tricholoma is a kind of white mushroom growing in Mongolian grassland, which contains a lot of vitamin D and tastes very delicious. The name Tricholoma is actually related to a city that is hosting the Winter Olympics. This city is Zhangjiakou. Because this mushroom was previously exported to the mainland through Zhangjiakou City, Hebei Province, it was also named "Tricholoma". 1958, Guo Moruo went to Zhangjiakou and wrote a poem (Mandarin? ): "The name of Tricholoma is all over the world. I don't know why it is called Tricholoma. Originally from Zhangjiakou, there are many mushrooms on the mouth. "