It wasn't just the beauty of the polished stone block walls or the fact that this abandoned city sits atop a narrow ridge more than 2400 meters above sea level.

VOA: standard.2009.12.15

But notice what this does. The first thing it does is, it says, let's check and make sure x is greater than or equal to 0. If it isn't, notice what's going to happen. None of that block is going to get executed, and it's going to come down here and print out a useful piece of information, which says, hey, you gave me a negative number. I don't know how to do this.

做的是和以前一样的事情,但是注释它做了什么，第一件做的事情就是,程序说，要去检查并且确信x是大于等于0的，如果不是的话，请注意会发生什么,下面的代码都不会被执行,程序会到这里来然后显示一些有用的信息,信息会说，嘿，你给了我一个负数,我不知道该怎么弄这个了。

麻省理工公开课 - 计算机科学及编程导论课程节选

It violates gravity, but six-month-olds aren't smart enough to know that a block just stuck over here is also surprising.

因为它违背了地心引力,但六个月大的婴儿还是不够聪明,他们没能发觉突出的木块也是令人惊奇的

耶鲁公开课 - 心理学导论课程节选

That says it's in here. It's in this tri-block. It raised an exception, but it wasn't and I O error.

这在这里它是一个try程序块,它报出异常，但他不是io错误。

麻省理工公开课 - 计算机科学及编程导论课程节选

What seems so obvious, at least to me here in reading Lycidas, is that at this point in 1637 there's a stumbling block or a hurdle that Milton in his race simply can't get over.

在我读的过程中，显而易见的是，是在1637年时弥尔顿在他的职业生涯里,有一道无论如何也过不去的坎。

耶鲁公开课 - 弥尔顿课程节选

the ropes will be pulling the block with T in the other direction, then I got 10 Newtons here.

绳子也会对另一物体施加方向相反的拉力 T,于是我知道这里是 10 牛顿

耶鲁公开课 - 基础物理课程节选

We'll give it a name, but by linking that T to that T, we can also figure out the same T must be exerted on this one by Newton's third law, because if this block is the only one that could be pulling this rope with T.

我们先给它命个名,把这个 T 和那个 T 联系起来,利用牛顿第三定律,我们可以知道这个 T 也一定作用在这个物体上,因为如果这个物体是唯一,受到绳子拉力 T 的物体

耶鲁公开课 - 基础物理课程节选