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1、protect from的意思是保护什么什么免受，因为from是介系词，所以后面一定要用名词或动名词的形式，也就是doing something，这里的介系词from后面接的是能带来伤害或损害的东西或动作。

2、如：He put every newspaper on the porch so as to protect them from wind, rain or snow.The regulation protects the city from being damaged.The rule protects the air in the city from being polluted.The rule protects the city from haze.。

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