3、例句如下：
I should look out if I were you! 如果我是你，我会小心的。
Look out! A truck's coming! Get out of the way. 车来了，快闪开！
Look out for hackers who might try to break your system. 小心那些想试图破坏你的`系统的骇客。
I'm just looking out for my family.我只是关心我的家庭而已。
look out 后接的介词
1、look out upon：朝向
例句：He longed for some central certainty, from which he could look out upon the world safe from hurt.
他渴望能有一个稳当的立脚点，既可观察世界又不受其害。
2、look out on：面临
例句：Today, we look out on the horizon of a new century.
今天，我们眺望新世纪的地平线。
3、look out at：向外眺望
例句：We love to sit on the floor and look out at the beach and the sea.
我们喜欢坐在大地板上，向外眺望海滩和大海。