You must look out for catching colds
你得当心不要着凉。
The salesmen are look out for possible prospect
推销员们正在寻找可能的客搜趣网户。
When crossing the street,look out for cars
过街时注意车辆。
There are some letters I'll have to look out.
有几封信我必须找出来。
The patient is able to look out for himself.
病人现在能自搜趣网己照料自己了
The group were warned to look out for pickpocket.
这些得到警告说要当心扒手。

look at
v. 看；考虑；着眼于
例句：
The children looked at their new teacher in curiosity.
孩子们好奇地望着新老师。
We should learn to look at problems all-sidedly.
我们应该学会全面看问题。
The manaxeitMger will not look at a report like that.
经理不会答理那样一份报告。
Look at that beautiful beach!
看看那些优美的海滩！
I look at you and me and I smile.
就要看你我在一起，只有微笑聊以蔚籍。
Look at the village below.
你看山下的那个村庄。
Look at that handsome boy!
你看那个英俊的男孩！
He could occasionally look at her.
他可以时不时地看她一眼。
Look at that exhaust from that bus!
您瞧瞧那部公车排出的废气！
How do you look at love?
你是怎样看待爱情的呢？
Look at this vast ocean.
你们瞧，这广阔的大海。
Look at my family photo!
看看我的全家福相片！
Look at me (the board).
看着我（黑板）。
What do they see when they look at me?
当xeitM他们看到我的时候，是怎样的看法呢？
希望能帮到你

例句;
1.The nurse looked at mexeitM sadly.
护士伤感地看着我。
2.She looked at him sadly .
她悲伤地望着他
3.He looked at me sadly through a mist of tears.
他泪眼模糊，悲伤地看着我。