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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  and they're natural valves that are recovered from the animals.
  都是从动物身上获取的天然瓣膜
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  Then, they're treated, they're cross-linked with a chemical
  然后经过处理 和一种化学物质交联
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  so that they become permanent structures,
  从而成为永久性的
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  non-living structures now.
  非活性结构
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  These sort of bio-synthetic valves,
  这种人工生物瓣膜
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  what's called in the caption here, a bio-prosthesis.
  就像这里的说明中所说 称为生物假体
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  Prosthesis just means replacement,
  假体就是替代品
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  so this is derived from natural tissue
  这种源自于天然组织的瓣膜
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  is an alternative to this mechanical valve.
  是相对于机械瓣的另一种选择
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  Physicians will use one of these types of valves or another
  医生会根据你所需要更换的瓣膜
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  depending on which of your valves needs replacement,
  以及他们以往
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  what their own experience is with people
  治疗类似病人的经验