look outside是看外面 outside在这里是名词，后面不加名词
look out of是从...往外看 of后面必须加名词
Look outside 是指单纯地看外面
Look out of指从...向外看
例如：
I was looking outside when my mom came in.
我妈妈进来的时候，我正在往外看。
I looked out of the window in class because I was too bored to listen.
我太无聊了，所以在课上从窗户往外看。
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