1.end up 结束

例句:The result was that the engine ended up at the bottom of the canal.
结果引擎最终沉到了运河底。

2.nuclear weapons 核武器

例句:The declaration deals with disarmament and the non-proliferation of nuclear weapons.
该声明涉及裁军和防止核武器扩散问题。

3.self-interest 利己主义

例句:Their current protests are motivated purely by self-interest.
他们当前的抗议完全是受一己之利驱使的。

4.focus on 专注于

例句:The talks will focus on economic development of the region.
会谈将着重讨论该地区的经济发展。