Why? Because that block identifies a set of things that I'm going to do if the test is true.

为什么呢？这是因为这一块指令,指定了一系列的要进行的操作,如果测试为真的话。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I want to remind you, that block of code is a set of instructions, the same set of instructions that are going to be done each time through the loop.

我想提醒大家,这块代码是一个指令集,一个每次循环都会被执行的相同指令集,会变化的仅仅是变量的值。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, what you do is you set up a couple of displays, one where the block is stopped, the other one where you take this away with a trap door and it keeps going.

所以,你可以设计几个演示,一个是木块被挡住了,另一个是用活门把木块挪开,使得屏板继续上升

耶鲁公开课 - 心理学导论课程节选