To use ps as a formula, we must first ensure that the ingredients in the formula are reasonable, the measurement is accurate and the process is correct; The list of ingredients and auxiliary materials, as well as each step, should have clear pictures and text descriptions, whether the typesetting of each picture and corresponding text is neat and decent, and whether the whole page is beautiful. If special instructions are needed, there should be obvious hints such as hints. For example: the following recipe-Pearl meatballs (according to the recipe of the clever chef Wen Yi)