They may be not on the national radar For me, in my own life, when I think of real heroes or even role models, or well-known people in the Patheon of struggle.
有哪些是你觉得人们需要了解的?,对于我来说,当我想到真正的英雄或者榜样时,或者先贤祠中的名人。
If I'm described to you as a vivacious and creative person and you see me and I'm all kind of bouncing around and everything, you could then confirm this as, "Look how vivacious and creative he is."
如果有人把我描述成一个活泼有创意的人,当你看到我上跳下蹿时,你就会以此来确认你所相信的,“看他多活泼多有创意”
So the exceptions are useful when you want to have the ability to say, I expect in general this kind of behavior, but I do know there are some other things that might happen and here's what I'd like to do in each one of those cases. But I do want to make sure that I don't let a value that I'm not expecting pass through.
所以当你希望有能力说,我希望一般是这样的行为,异常是很有用的,但是我明白还有一些其它的情况可能发生,我希望对每一种情况都这么做,但是我跟希望能保证,没有让一个预期之外的情况漏过去。
That means, when I take two derivatives, I want to get a, then you should know enough calculus to know it has to be something like at^, and half comes from taking two derivatives.
也就是说,当我想求二阶导时,得到了a,你应该有足够的微积分知识,才能知道必须有类似at^的项,而这个1/2则是因为求了两次导数
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