Here,he uses a set of buttons attached to a computer to make the silent robot move forward, backward or around in circles.

VOA: special.2009.12.17

We're not going to run around in circles forever.

我们并不想一直徒劳无益。

哈佛公开课 - 计算机科学课程节选

We're not going to run around in circles forever.

我们并不想一直徒劳无益。

哈佛公开课 - 计算机科学课程节选