“外面走一走,回家漱漱口”是一种良好的卫生习惯。因为,人走在户外,空气中的许多细菌,病菌会停留在口咽部、鼻咽部。温暖、潮湿的口腔正是它们生长繁殖的温床,其中一部分随着呼吸进入人的气管、肺部,当人体抵抗力下降时就容易发病。特别是空气污染严重的地方,情况更为严重。如 “Walking outside and going home gargle” is a good hygiene practice. Because, people walking outdoors, many bacteria in the air, the bacteria will stay in the oropharynx, nasopharynx. The warm, damp mouth is just a hotbed for their growth and reproduction. Some of them enter the trachea and lungs of the human body as they breathe, making it easier to get sick as the body’s resistance drops. Especially in places with serious air pollution, the situation is even worse. Such as