Kotloff说，流感病毒是狡猾的，很难预知。
Kotloff says that influenza is a wily virus, one that is difficult to predict.
你很难预知，将在18岁还是40岁甚至更沧桑的时分，才真正触摸到倾心的爱好。
It's very difficult to predict, the 18-year-old or 40-year-old even vicissitudes of midnight, truly touched focused hobbies.
另一方面，这部电影可能不会出现电影学院投票者所期望的大胆冒险或角度，因此很难预知这部影片的命运。
On the other hand, this might be a film that doesn't take the risks or perspective that Academy voters hope for, and so it's hard to know what fate awaits it.
我们所讨论的系统有几个输入，其中某些输入称为控制量，因为这些量是可以人为地控制的，而另一些输入称为外部扰动，它们是很难预知的。
We shall consider systems with several inputs, some known as controls because they may be manipulated and others called external disturbances, which are quite unpredictable.
但是在可预知的将来，我认为缺乏创造力是我们的局限，但不是固有的困难。问题很难，但并非不可解决的。
But for the foreseeable future I think it's our lack of ingenuity that is limiting, not the intrinsic difficulties; the problems are difficult-but not insurmountable.
由于他们很难想象在未经批准的情况下也可获得一份工作，他们无法相信上帝之手或者机缘把他们推向不可预知的未来。
The students are startled. They can hardly conceive of a career that was not preplanned. They can hardly imagine allowing the hand of God or chance to nudge them down some unforeseen trail.
这很难演，但也很有趣，因为你无法预知他要做什么。
It's difficult to play, but it's also interesting, because you can't predict what he'll do.
这很难演，但也很有趣，因为你无法预知他要做什么。
It's difficult to play, but it's also interesting, because you can't predict what he'll do.
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