It's kind of a silly tradition that we started a few years ago.

这或许是个有点奇怪的传统,但我们从几年前就已经开始这样做了。

哈佛公开课 - 计算机科学课程节选

And you might have started doing these kinds of things in Scratch as your programs got more sophisticated.

并且你可能已经开始在Scratch中开始做这种事情了,随着你们的程序变得越复杂。

哈佛公开课 - 计算机科学课程节选