look into 调查,观察,在...里查资料
1.观赏
They stopped to look into the window.
他们停下来看看橱窗.
2.调查
The government has set up a working party to look into the problem of drug abuse.
政府已成立工作组调查滥用毒品问题.
3.看
to look into the mirror
照镜子
look for 指寻找,更倾向于找的过程,动作,（顺便提一下）
look up 一般指在字典里查找单词什么的,
look up the word in the dictionary.