look for 寻找
She is looking for her lost child.
她正在寻找失去的孩子.
look up 查询
If you don't know a word,you can look it up in a dictionary.
如果你有不识的字,可以查字典.
look after 照顾
Who will look after your children while you go out to work?
你上班时谁来照料你的孩子?
look at 看
Look at the map,please.
请看这张地图.