Now we can think about the fourth period, and the fourth period is where we start to run into some exceptions, so this is where things get a teeny bit more complicated, but you just need to remember the exceptions and then you should be OK, no matter what you're asked to write.
现在我们可以考虑第四周期,而且在第四周期,我们会遇上一些特例,所以事情有,一点复杂,但是你只需要记住,这些特例然后就没有问题了,无论你被要求写什么。
OK. Now, last thing about variables, and then we're going to start pushing on this, is where can you use them?
好,关于变量的最后一件事,然后我们就要,结束这个话题了,这个问题就是在什么地方可以应用变量?
So this, where we start at zero is not a node, is the first thing to point out.
零点不是节点,这是第一个要指出来的,当我们。
This is where, the way that we should start every problem set or ever problem.
这是我们,解决任何问题的最初一步。
And where we where at the start of the 20th Century in the late 1890's is that we were at a place where there was great confidence in our understanding of the universe, and our understanding of how all matter worked.
0世纪开始讲起,在19世纪的九十年代,人们对于自己,对自然的理解,对自然所有物质,如何工作的理解十分自信。
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