美国强调核材料的安全问题

prevent from阻止, 防止
例句：His prompt action prevented the fire from spreading.
他的果断行动制止了火势的蔓延。

2. The nuclear security summit was set up specifically two years ago and this one as well to deal with the security of nuclear materials from terrorists.

set up建立，建造, 创立, 竖立
例句：Plenty of foreign firms have set up factories here.
很多外国公司已在这里开办工厂。
deal with与...交涉,交易;应付;处理
例句：He has learnt to deal properly with all kinds of complicated situations.
他已学会恰当地应付各种复杂局面。

3. In terms of the atomic accident at Fukushima or elsewhere, that was done by the International Atomic Energy Agency.

in terms of就…而言, 从…方面说来
例句：He thought of everything in terms of money.
他是从钱的角度来看每一件事。

4. For example, instead of making highly enriched uranium for their reactors, they now make lower enriched uranium which is less useful for acts of terrorism of nuclear bombs.

instead of (用…)代替…, (是…)而不是…, (用…)而不用…
例句：We went to the Biology class instead of attending the English lesson.
我们去上生物课而不去上英语课。

5. Dr. Weitz believes that the Seoul Nuclear Security Summit will continue to provide a top-level platform for world leaders to coordinate international efforts to combat nuclear terrorism as well as non-proliferation issues.

provide for为…提供
例句：The local government provided special buses for the guests.
地方政府为宾客提供了专车。