Heart transplants were once considered immoral–how could you open the chest cavity of one person and transplant the heart into the body of another person?
心脏移植曾经一度被认为是不道德的——你怎么可以在一个人的胸部开个洞，然后把心脏移植到另外一个人的身体里呢？
You probably noticed that your shoulders raised, your chest cavity expanded and you felt the air in the upper part of your stomach. If you didn't, try it again.
你会发现，你的肩升高了，你的胸腔舒展开了，你感觉空气进入你的胃中；如果没有，那就再来一次。
Our two lungs are made up of a complex latticework of tubes, which are suspended, on either side of the heart, inside the chest cavity on a framework of elastic fibers.
我们的两片肺是由复杂的管子交叉网组成的，在心脏的两侧悬浮着，在有弹力纤维构成的框架的胸腔里。
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