The catering industry has the highest frequency of spelling mistakes. It is very common for restaurants of all sizes to write "box lunch" as "combined meal" or "combined meal". The menu "fried cucumber with meat" can be written as "fried in yellow claws", but the four words can be misspelled. There are many similar mistakes. In addition, the signs of some shops also have typos. For example, "gold jewelry" is written as "gold jewelry", "restaurant" is written as "food management", "communication" is written as "newsletter", "video" is written as "telephone directory" and "this house is for rent" is written as "this house is out of the group". The phenomenon of handwritten advertisements in some stalls creating their own Chinese characters is also serious. For example, the right half of the word "employment" in "recruitment" was confused by several strokes, the word "chicken" in "chicken fillet" was changed to three dots, and the word "bean" in "kitchen" was written as "minister".