So for such a simple machine, the lever is capable of some pretty amazing things.

所以别看它只是个简单机械，杠杆可是能做很多神奇的事情呢。

The typical screen is a relatively simple machine to operate.

典型的筛子操作非常简单。

It's a simple machine with a belt and rollers that you move with your effort.

这是一个简单的机器用皮带辊道，你将与你的努力。

And using this very simple machine, my lab and others have done dozens of studies showing just how good babies are at learning about the world.

用这个简单的仪器，我的实验和其它实验做了几十项研究，证明了小孩子们在理解世间万物上是多么得聪明。