It is like one piece of jack puzzle.

就像字谜中的一个空格。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

So it is a very thin and quick move, one on a second, by which I mean that one electrode, one set of neurons is the a very important piece of the puzzle, but not all that you need.

所以说，这是一个非常细微而迅速的动作，一秒钟一次，我是说一个电极，一组电极对于去猜整个谜很重要，但是你需要的远不止这些。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Another one might be "wait one second" which is another building block or puzzle piece and scratch.

另一条语句可能是“wait，one，second“,这条语句组成块或者片。

哈佛公开课 - 计算机科学课程节选

As an aside, if you ever just have one line of code that you want to execute, one puzzle piece in Scratch terminology, ; you actually don't need the curly braces; you only need the curly braces if you have two or more lines of code that you want to execute if that condition is true.

此外，如果你只有一行代码,需要执行，在Scratch，术语中叫做,一句代码，你就不需要使用花括号了;,如果那个条件成立，你有两行或更多行的代码时需要执行时,你就需要花括号。

哈佛公开课 - 计算机科学课程节选