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On Thursday, we'll look at why that allows you to do lots of things more conveniently than you can do without mutation.
周四我们会探讨下,为什么这种可变性会让你,在进行很多操作的时候方便了许多。
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We talked about the inevitability of death; we talked about the variability, that people have different lengths of time before they die.
我们讨论过了死亡的不可避免性;,我们讨论过了其可变性，不同的人在他们死之前有所的时间长度不同。
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It's extremely powerful, but what we haven't seen yet is mutation.
这确实很强大，但是我们还没有说到可变性呢。
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But in fact, logically speaking at least, variability, although it's a requirement for unpredictability, doesn't guarantee unpredictability.
但实际上，至少在逻辑上讲，可变性虽然是不可预见性的必要条件，但是不可预见性却不是必然。
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Now, you might think, ? well, didn't we already discuss that when we started thinking about variability?
现在你可能会想，我们不是已经谈过这个了吗,就在我们开始讨论死亡可变性的时候？
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In our world, not only do we have variability, we've got unpredictability.
在我们的世界不仅有可变性，还有不可预见性。
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In addition to the inevitability, in addition to the variability, in addition to the unpredictability, there's the fact that death is, as I like to think of it, ubiquitous.
除了不可避免性之外，除了可变性之外，除了不可预知性之外，还有个事实便是死亡，是无处不在的，正如我所想的那样。
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But you see the difference. Great question, and a very important thing to understand, and that's why I'm belaboring this point, since this is where people tend to get pretty confused, and this is why mutation is very important to understand. Yeah.
但是你们已经发现区别了，这问题挺好的，并且有重要的一点需要我们去注意的是，人们经常对可变性这一点感到很迷惑，但是可变性是很重要的,我们需要理解它,这也是我经常强调这一点的原因。
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And for that matter, there could still be variability.
虽然如此，这里仍然可以存在可变性。
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We've had inevitability; we had variability.
我们讨论过了死亡的必然性;,死亡的可变性。
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What about the variability of death?
死亡的可变性又如何？
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But in keeping with the focus of our discussion about the badness of death, I want to put aside the moral question ? and think about how good or bad for me ? is it that there's variability in death?
但是为了重点讨论,死亡的坏处，我要撇开道德问题不谈,转而考虑这种情况对我是好是坏,如果死亡有可变性的话？
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Because notice that what remove did, it was it actually changed the list.
可变性了对不对？,请注意remove操作。
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