America is keen to seek a fresh round of UN sanctions in the hope of forcing it to scrap its nuclear programme.
美国正极力寻求联合国新一轮的制裁，希望迫使伊朗放弃核计划。

2.in custody 被拘留

A 17-year-old youth was remanded in custody yesterday.
一名17岁的年轻人昨天被还押候审。

3.steps up 增加；提高

He urged donors to step up their efforts to send aid to Somalia.
他敦促各捐赠方加快速度将援助物资送往索马里。

4.do business with 与...做生意

You will stand to lose if you do business with him.
跟他作生意你是要吃亏的