1·When there's a fire, follow the teachers' instructions, leave the classroom quickly and use a piece of cloth to cover your mouth and nose so that you don't breathe in smoke.
发生火灾时，按照老师的指示，迅速离开教室，用一块布遮住口鼻，以免吸入烟雾。
2·A person needs only to breathe in a small number of these germs to become infected (although only a small proportion of people will become infected with TB disease).
人只要吸入少量这些病菌，即受到感染(虽然只有少数人感染结核病)。
3·They breathe in air, then extract the oxygen and pass it into the bloodstream, where it's rushed off to the tissues and organs that require it to function.
他们吸入空气，然后把氧气提取出来并进入血液的流动中，被带到需要氧气来维持功能的组织和器官中。
4·As well as being at increased risk of a series of respiratory conditions, the lungs of children who breathe in passive smoke may also develop more slowly than children who grow up in smoke-free homes.
除了对儿童的呼吸道产生一系列的危害外，经常被动吸入香烟的儿童，其肺功能的发育要比无烟家庭孩子的来得慢。
5·This will help retain your own body heat around your nose and mouth and will add some warmth and moisture to the air you breathe in.
这样既有助于保暖又可以给那些你不得不吸入的冷空气增加一些温度和湿度。