来自《耶鲁大学开放课程：生物医学工程探索 第25集 第25集》
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that use these kinds of materials are performed every year.应用了这些材料 -
Another example of using synthetic materials like that另一个应用人工材料的例子 -
is in the heart valve.就是人工心脏瓣膜 -
We talked about how heart valves function several weeks ago.几周前我们讲过了心脏瓣膜的功能 -
We talked about我们提到 -
how your heart becomes very inefficient in its pumping action如果瓣膜不能正确工作 心脏跳动 -
if the valves don't work properly.就会非常没有效率 -
There are diseases of valves that are not uncommon.而心脏瓣膜基本并不少见 -
Many people, decades ago, died because--十几年前 很多人死于 -
at relatively young ages在相对年轻的岁数 -
because their heart valves would stop working.因为心脏瓣膜停止工作而丧命 -
Their heart, even though it was beating properly,他们的心脏尽管正常搏动