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▲protect...from短语的意思是“保护……不受……的侵害”.
from介词之后常跟对公众或社会整体影响不太大的普通词语.如果后面接较大的事件或较重要的东西,如战争、灾害、骚扰、税款等时,from多由against代替.
如：I want to put on more clothes to protect myself from cold．我想多穿件衣服,以防受凉.
We should try our best to protect children from danger．我们应该尽力保护儿童免受危害.
Something has been done to protect the grain from rain．为了防止粮食被雨淋,已经采取了一些措施.
The government has done much to protect the dam against the possible flood．政府花费了很大精力以防大坝受可能的洪水的袭击.
What we did for the refugees is to protect them against starvation．我们为难民所做的是保护他们免遭饥荒.

▲prevent...from短语的意思是“阻止……的发生”.类似的短语还有stop...from,keep...from.当prevent／stop...from用于主动语态时,介词from可以省略,但当prevent／stop...from用于被动语态时,介词from不可以省略.
如： The heavy snow prevented us from going out for sports．＝The heavy snow prevented our going out for sports．大雪阻止了我们外出活动.
The shelter is built to prevent the goods from the sun．搭建棚子的目的是保护产品免受阳光照射.
The new government has passed some new laws to prevent the rivers and lakes(from)being further polluted．新一届政府制订了一些新的法律,以阻止河流湖泊被进一步污染.
I am confident that by doing this we can prevent／stop such an incident(from)happening once more．我深信,通过做这件事,我们能够阻止类似事件的再次发生.
Nothing could prevent us from coming here．没有任何事情能阻止我们到这儿来.
No one can stop us(from) leaving we have made up our minds．一旦我们拿定主意,没人能够阻止我们离开的.

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祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~ 你好

▲protect...from短语的意思是“保护……不受……的侵害”.
from介词之后常跟对公众或社会整体影响不太大的普通词语.如果后面接较大的事件或较重要的东西,如战争、灾害、骚扰、税款等时,from多由against代替.
如：I want to put on more clothes to protect myself from cold．我想多穿件衣服,以防受凉.
We should try our best to protect children from danger．我们应该尽力保护儿童免受危害.
Something has been done to protect the grain from rain．为了防止粮食被雨淋,已经采取了一些措施.
The government has done much to protect the dam against the possible flood．政府花费了很大精力以防大坝受可能的洪水的袭击.
What we did for the refugees is to protect them against starvation．我们为难民所做的是保护他们免遭饥荒.

▲prevent...from短语的意思是“阻止……的发生”.类似的短语还有stop...from,keep...from.当prevent／stop...from用于主动语态时,介词from可以省略,但当prevent／stop...from用于被动语态时,介词from不可以省略.
如： The heavy snow prevented us from going out for sports．＝The heavy snow prevented our going out for sports．大雪阻止了我们外出活动.
The shelter is built to prevent the goods from the sun．搭建棚子的目的是保护产品免受阳光照射.
The new government has passed some new laws to prevent the rivers and lakes(from)being further polluted．新一届政府制订了一些新的法律,以阻止河流湖泊被进一步污染.
I am confident that by doing this we can prevent／stop such an incident(from)happening once more．我深信,通过做这件事,我们能够阻止类似事件的再次发生.
Nothing could prevent us from coming here．没有任何事情能阻止我们到这儿来.
No one can stop us(from) leaving we have made up our minds．一旦我们拿定主意,没人能够阻止我们离开的.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~