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prevent from 、stop from、keep from 、protect from 所有用法和区别

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prevent from 、stop from、keep from 、protect from 所有用法和区别
总是搞不懂,望那位老师指点迷津!
prevent/stop/keep… from doing…这三个句式的意义都是“阻止……做……或阻止某事的发生”,而protect…from/against…表示“保护……免受……

prevent/stop/keep... from doing..表示“阻止某人做某事”例如:
We must prevent the water from being polluted.
What stopped him from coming here.

protect…from/against…表示“保护……免受……”例如:
Protect children from violence
保护儿童免遭暴力侵犯.