是否戴口罩看天气而定冬季天气寒冷,又是雾霾多发季节。我们在冬季戴不戴口罩,要根据“趋利避害”以及“两害之间取其轻”的原则定。在能见度较好、空气比较干净的天气里,我们不必戴口罩;而当大雾或霾出现时,我们最好戴口罩。一些怕冷的同学即使在能见度较好、空气比较干净的天气里,也戴着口罩,以为可以防寒,其实这样并不科学。人的呼吸道如鼻、咽、喉、气管、支气管表面,覆盖有许多黏膜,黏膜 Whether to wear masks to see the weather may be cold winter weather, but also the haze season. We wear masks in winter, according to the principle of “avoiding disadvantages” and “taking care of each other”. We do not have to wear a mask in better visibility and cleaner air, and we wear a mask when fog or haze appears. Some students are afraid of cold Even in the visibility is better, the air is relatively clean weather, but also wearing a mask that can prevent cold, in fact, this is not scientific. Human respiratory tract such as nose, pharynx, larynx, trachea, bronchial surface, covered with many mucosa, mucosa