来自《耶鲁大学开放课程：生物医学工程探索 第12集 第12集》

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  If we could make the particles better,
  如果能够做出更好的颗粒
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  such that they worked for three months,
  一次注射能管三个月
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  that makes it even more possible.
  那就更可行了
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  If they work for a year--then once a year,
  如果能持续有效一年 也就是一年注射一次
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  and you can see that's a therapy that would be acceptable to most people.
  这个疗法就能被大多数人接受
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  It's an example of an approach but it also shows the constraints of the approach.
  这是一个例子 但也暴露了它的不足之处
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  So far we can do a month;
  目前我们能维持一个月
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  we'd like to be able to do longer.
  但我们想维持得更长
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  As we do longer this will become a more--
  有效期越是延长
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  a therapy that's more likely to be adopted into clinical practice.
  这种疗法就越有可能被应用于临床实践
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  You can imagine that making it longer requires better engineering of these particles.
  可想而知更长的有效期需要更好的工程技术
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  It's hard to make particles that are really small
  要做出那么小的颗粒