? What is the meaning of "look and smell"? What's the allusion? What is the English translation?

An allusion to the source: "Ancient and Modern Medical System": "The four words "look, smell, ask, and cut" are the program of medicine". Idiomatic meaning: A term used in Chinese medicine. Look, means to look at the color; smell, means to listen to the sound; ask; means to inquire about the symptoms; cut; means to feel the pulse. The four diagnostic methods are collectively known as the four diagnostic methods. 成语结构：联合式成语 English translation: watch ,hear, ask and touch (a diagnosis method) 近义词：神圣工巧 Idioms by idiom: 清-李汝珍《镜花缘》第74回："We have to watch ,hear, ask and touch even though we are veterinarians."