1 inch =3.3333333 cm. "Inch" is a traditional unit of length in China, which is expressed in decimal system by "ruler" and "ruler" (10 inch = 1 ruler,1ruler = 1 ruler). In Korea, it is used to indicate the number of relatives, for example, 1 inch indicates the relationship between two generations.

The laws of Hong Kong follow the ancient system (1 inch = 3.33cm), but this unit in Hong Kong hardly uses it, and only uses "inch" (1 inch = 2.54cm) and "centimeter". "inch" usually means "inch"