Air enters the body through the nose and passes through the nasal cavity, which is lined with a mucous embrane and fine hairs (cilia) to help filter out foreign bodies, as well as to warm and moisten the air.

空气通过鼻子进入身体并通过鼻腔，鼻腔内衬有粘膜和细毛（纤毛），以帮助滤掉异物，保持进入空气的温暖和湿润。