1·It first infects you because you breathe in some of the infectious agents.
只要吸入病原体，你就会被感染。
2·For the most part, however, we breathe in the aromas which surround us without being consciously aware of their importance to us.
然而，在大多数时候，我们呼吸着周围的香气，却没有意识到它们对我们的重要性。
3·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。
4·In smoggy weather, the machine would breathe in the air in front of the bike and blow out a stream of clean air toward the biker's face.
在有雾霾的天气里，机器会吸进自行车前面的空气，然后向骑自行车的人的脸上吹出一股清新的空气。
5·O Sit outside and breathe in the air.
坐在室外，呼吸新鲜空气。
6·Breathe in and out; then switch back and forth.
吸入、呼出，然后再切换往复。
7·Notice how your hands move as you breathe in and out.
注意双手在呼吸时如何地运动。
8·Try to breathe in between sentences, and don't talk too much.
尝试下在每个句子之间调整下呼吸，不要说得太多。
9·Breathe in through your nose, and out through your mouth. Slowly.
用你的鼻子吸气，然后从嘴里呼出来，慢慢的，重复这一动作。
10·Now open one nostril and breathe in and out slowly then switch nostrils.
露出一个鼻孔慢慢地呼吸，然后换一个鼻孔。
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。