Outside the Hudson's Bay company store in downtown Vancouver, a line of people stretches down the block.

VOA: standard.2010.02.17

You can say if this is true, then go and do the following pieces of code or puzzle pieces that are inside this part of the block, else go ahead and do these that are down here.

你可以说如果条件成立，执行下面的代码段,或板块中的拼图，否则跳过去执行这下面的语句。

哈佛公开课 - 计算机科学课程节选

Neiman Marcus is actually down the block, so there is a lot of competition between the stores.

内曼•马库斯百货公司就在隔壁，所以商店间竞争很是激烈。

在布鲁明戴尔百货 - SpeakingMax英语口语达人

The cookies were going back and forth and back and forth and the hearts up and down, well, this thing that we had that called a loop last week with a forever block with a statement inside of it is simply gonna look a little something like this.

这些饼干人来来回回的移动,还有这些爱心们上上下下地漂浮,都用到我们上周提到过的循环结构,当然还有个声明在里面，就有点像屏幕上,显示的这样。

哈佛公开课 - 计算机科学课程节选

And so, we walk that distance from Pierson College down to the York Street Gate, over to Chapel Street, make the left on Chapel Street, another block down to High walk into the Starbuck's.

然后，我们从皮尔逊学院出发,沿着约克街走，越过新教堂街，向左转，又穿过一条街道,走到星巴克。

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If you go back down Powell, like a block or two,

你到鲍威尔街，离这里一、两个街区的路程，

充满乐趣 - SpeakingMax英语口语达人

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