他用一个旧袋子遮住头来防晒。

He shielded his head from the sun with an old sack.

《柯林斯英汉双解大词典》

他指着自己的头来奚落武装警察，仿佛是在招惹他们开枪一样。

He taunted armed officers by pointing to his head, as if inviting them to shoot.

《柯林斯英汉双解大词典》

我的父母安装了一个摄像头来监督我。

My parents set up a camera to keep an eye on me.

youdao

OK. With that in mind, let's go back to where we were. And where were we?

我们回过头来看看，我们讲到哪里了？,我们正在开始讲二分查找？

麻省理工公开课 - 计算机科学及编程导论课程节选

Now, if the current is sent one way through the read/write head the area is polarized in one direction.

如果当前通过读写头来发送指向一个方向的信息,这个区域的磁极指向某个方向。

哈佛公开课 - 计算机科学课程节选

All right. So now that we have a general idea of what we're talking about with shielding, we can now go back and think about why it is that the orbitals are ordered in the order that they are.

现在我们对于谈论的屏蔽,有一个整体观点了，我们现在可以回过头来考虑,为什么轨道是按照,那种规则排列的。

麻省理工公开课 - 化学原理课程节选