"Kids really get engaged in science in the garden where it's a kind of fun activity where they're collecting data and seeing how different temperatures will change the amount of water that's needed by a crop, so the science concepts come easily."
VOA: special.2011.06.14
I, somehow if, I want to walk through some sequence of data structures, gathering up or doing the same thing, adding ages in until I get a total age and then divide by the number faculty.
我想,以某种方法,来遍历,一些数据结构,把它们相同的属性加到一起,就是一直的把年龄加到一起一直到,得到了一个年龄总数,然后除以员工的数目。
How do you get data off the hard disk?
那怎样从磁盘中得到数据?
Well, there are many factors, but one important factor is, the rise of the Internet has competed with -people used to buy The Wall Street Journal to get data like this.
其实有很多因素,但是最主要一点是,来自网络的竞争,人们过去买《华尔街日报》来获取这些数据
A second problem is what I was talking about immediately before this is some of our data are misleading so we get a lot of the information about the world from the media.
刻板印象的另一个问题是,我刚才就讲了,我们接收到的有些信息是误导人的,我们能接收到这个世界很多信息,从媒体上接收到。
So we're to assume we can get to any piece of data, any instruction in constant time, and the second assumption we're going to make is that the basic primitive steps take constant time, same amount of time to compute. Again, not completely true, but it's a good model, so arithmetic operations, comparisons, things of that sort, we're all going to assume are basically in that in that particular model.
因此如果我们假设在恒定的时间内,我们可以取得任何一块数据,任何一种数据结构的话,我们要做的第二个假设就是,基本的原始操作计算花费的时间是恒定的,这个假设也不是完全正确的,但这个模型其实挺不错的,因此算法操作,比较,这一类的事情,我们在这个特定的模型中都假设是基本的,操作,花费的时间是恒定相同的。
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