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▲protect...from短語的意思是“保護(hù)……不受……的侵害”.
from介詞之后常跟對公眾或社會整體影響不太大的普通詞語.如果后面接較大的事件或較重要的東西,如戰(zhàn)爭、災(zāi)害、騷擾、稅款等時,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,以防受涼.
We should try our best to protect children from danger．我們應(yīng)該盡力保護(hù)兒童免受危害.
Something has been done to protect the grain from rain．為了防止糧食被雨淋,已經(jīng)采取了一些措施.
The government has done much to protect the dam against the possible flood．政府花費了很大精力以防大壩受可能的洪水的襲擊.
What we did for the refugees is to protect them against starvation．我們?yōu)殡y民所做的是保護(hù)他們免遭饑荒.

▲prevent...from短語的意思是“阻止……的發(fā)生”.類似的短語還有stop...from,keep...from.當(dāng)prevent／stop...from用于主動語態(tài)時,介詞from可以省略,但當(dāng)prevent／stop...from用于被動語態(tài)時,介詞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．大雪阻止了我們外出活動.
The shelter is built to prevent the goods from the sun．搭建棚子的目的是保護(hù)產(chǎn)品免受陽光照射.
The new government has passed some new laws to prevent the rivers and lakes(from)being further polluted．新一屆政府制訂了一些新的法律,以阻止河流湖泊被進(jìn)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,通過做這件事,我們能夠阻止類似事件的再次發(fā)生.
Nothing could prevent us from coming here．沒有任何事情能阻止我們到這兒來.
No one can stop us(from) leaving we have made up our minds．一旦我們拿定主意,沒人能夠阻止我們離開的.

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