1.look at 考虑；着眼于

His girlfriend is pretty to look at.
他的女朋友长得好看。

The boy stole a look at his father with grimace.
那男孩扮着鬼脸偷看了他父亲一眼。

2.happen to 发生于；偶然发生

Yes, it could happen to any of us, but yesterday it happened to them.
是的，这可能发生在我们任何一个人身上，但是昨天却发生在他们身上了。

There are some things that you can only understand when they happen to you.
事实上有些事情直到真的发生在你身上你才能了解你自己的感受。