The kitchen staff of the catering industry are required to wear masks, only the brand of McDonald's as well as the concept of quality advocated by the may make her able to transcend the outside, we can not simply people cloud, do catering, if we all have to learn from McDonald's, then Chinese food in the world of cattle fork of the day is not far away, in other words, it is the small store clerk to wear a mask and McDonald's do not wear I still think that McDonald's clean, because "clean" the concept is never by the mouth out, but by standardized management to do it bit by bit, and so on. Because the concept of "clean" is never brought out by the mask, but by standardized management of the little by little to do out.