There is a scratch panel - just like a lottery ticket with number on the drug - each drug has a different number.

VOA: standard.2010.06.07

Thus far and in Scratch will pretty much focus on the idea of correctness: Does your code work as we asked it to and as you intended it to?

至此，人们大都是把注意力集中于正确性,观点上：你的代码是不是根据你的意愿,并按照你的要求来执行呢？

哈佛公开课 - 计算机科学课程节选

Scratch And after just a few words on Scratch which we'll look at in more detail on Friday will you actually feel that you know what, this is actually very intuitive.

现在先粗略介绍一下,周五我们会更详细地讲,你会感觉到这其实是很直观的。

哈佛公开课 - 计算机科学课程节选

So first thing we should do is scratch our heads and see what's going on here. Alright, let's look at it. What's happening here?

所以我们要做的第一件事,就是抓抓脑袋看看发生了什么,好了，让我们来看看，这儿发生了什么呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

So, they developed this bifurcated tool, which would be appl--you'd put the stuff on the surface of the tool and then you'd scratch the skin in a certain way so that you could produce sort of a reproducible introduction of the vaccine into the skin.

所以他们发明了一种分为两叉的工具,把疫苗抹在这种工具表面上,然后以某种方式在皮肤上刮,这样就能将疫苗,重复不断地引入到皮下

耶鲁公开课 - 生物医学工程探索课程节选

We've seen this branching construct in Scratch, we've seen it a moment ago on the slide, and see, we just need else if to use not an else, not just an if but an else if.

我们看到了这个Scratch的分支结构，我们看到刚才在幻灯片中，了解到，我们不需要,用一个else，也不只是用一个if，而是用一个。

哈佛公开课 - 计算机科学课程节选

And in Scratch did you probably see the key word "and" on one of the blocks.

在Scratch中，你们大概看到那个关键字,“and“在其中一个程序块中。

哈佛公开课 - 计算机科学课程节选

So with problems at zero, ; which will be posted in two forms; PDF PDF for standard and PDF for hacker on cs50.net tonight, you will have the choice of implementing pretty much any scratch projects you can think of, and which subject to very few constraints.

对于问题集，我们提供了;,标准PDF以及可编程,今晚它们都会被放在CS50，net上，你可以选择任何,你想到的项目，范围不限。

哈佛公开课 - 计算机科学课程节选