"If they want to come over to the White House and go over line-by-line what is going on, I will be happy to do that,"
VOA: standard.2009.07.29
The other obvious one to do would be worst case. Again, over all possible inputs to this function, what's the most number of steps it takes to do the computation?
很明显另一种就是针对最坏的情况了,也就是在所有可能的输入,里面选出用的,步骤最多的那个输入?
I want-- I know I'm running you slightly over, I want to do one last example, it's, I also want to be able to do, have variables to store things.
我想-我知道讲的有点多了,我想给大家看最后一个例子,这里我想做的是,通过变量来存储东西。
It might be worth pausing over the variety of ways in which we can think of signs in language, all of which have to do with the way in which a given sign might be chosen to go into a speech sentence.
这也许值得尝试,为了理解语言和符号的关系,这一切都和符号怎样,被选择为一段话语的构成部分有关系。
Nuclear power, for example, may be our salvation when we run out of oil--or virtually run out of oil-- it seems to be coming up over the next several decades-- we're going to have to do that, we're going to need nuclear power.
比如说核能,在石油资源枯竭,或快要枯竭的时候,也许再过几十年,这一天就会来临,核能可能成为我们的救世主,那时我们就需要核能源了
We don't always want to go and solve the Schrodinger equation, and in fact, once we start talking about molecules, I can imagine none of you, as much as you love math or physics, want to be trying to solve this Schrodinger equation in that case either. So, what Lewis structures allow us to do is over 90% of the time be correct in terms of figuring out what the electron configuration is.
我们并不想每次都去解薛定谔方程,而且实际上,一旦我们开始讨论分子,我可以想象,你们中没有一个人,不管你有多么热爱数学或物理,会想去解这种情况下的薛定谔方程,总之,路易斯结构能让我们,有超过,90%,的概率判断出正确的,电子排布。
So, the point is whenever you have derivatives with something over dt, do not hesitate to cancel the dts This will be actually true as long as both quantities are vanishingly small.
关键在于,只要你推出的式子分母上有dt,不要犹豫,直接约掉,这个式子只在,两遍都是无穷小的情况下成立
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