If you think of the idea, you think of the basic logic, and then you go ahead and drag and drop accordingly.

如果你有这个想法，然后你考虑下基本的逻辑，你就能做相应的拖动或下降。

哈佛公开课 - 计算机科学课程节选

And if I want to detach it, I just click and drag, and now I can go back and put different puzzle pieces there altogether.

另外，假如我想分离它，我只需要单击并拖动，然后就可以回到过去那个状态,再继续把不同的拼图放到一起。

哈佛公开课 - 计算机科学课程节选