1.worry about 焦慮…；擔(dān)心…

I have nothing to worry about in this life.
我這一生都很省心。

Today he does not have to worry about making a living.
現(xiàn)在他不用為生活發(fā)愁了。

2.demand for 要求

Extensive advertising can cause a factitious demand for an article.
大規(guī)模的廣告宣傳能引起對某一商品的反常需求。

This massive investment indicates that there is demand for virtualization of resources inside the cloud.
這樣巨大的投資表明，對云中資源的虛擬化存在著巨大的需求。

3.prevent from 阻止，制止

To prevent and investigate illegal activities; to attack and take precautions against terrorism; to maintain the public order and prevent from activities against public order.
預(yù)防、制止和偵查違法犯罪活動；防范、打擊恐怖活動；維護(hù)社會治安秩序，制止危害社會治安秩序的行為。

Ridgewell calculated that, with current carbon prices, farmers could earn 23 euros per hectare for the CO2 they prevent from reaching the air.
Ridgewell的計算結(jié)果指出，按照當(dāng)前的碳價，農(nóng)民們將因他們在控制碳排放上的貢獻(xiàn)從每公頃土地上得到23歐元的回報。