VOA慢速英语:United States, European Union say Iran May be Ready to Return to Nuclear Talks

2. cautious adj. 十分小心的,谨慎的
例句：The boss is cautious about making promises.
老板对承诺持谨慎态度。

3. purpose n. 目的; 意图
例句：He returned to his homeland with the purpose of serving his own people.
他返回祖国, 意在为祖国人民服务。

4. recognize vt. 承认[认清](某事物); 认识到
例句：He has not recognized the seriousness of the present situation.
他还没有意识到目前形势的严重。

5. acknowledge vt. 承认
例句：I acknowledge that her criticism is just.
我承认她的批评是公正的。

6. discontinue v. (使)终止,中断,中止
例句：The bus service was discontinued because nobody used it.
那条公交线因没有乘客而停止营运。

7. urge vt.力劝; 敦促；鼓励; 极力主张；驱策, 促使
例句：He urged the necessity for immediate action.
他强烈要求立即采取行动。

8. block vt. 阻挡,妨碍,阻止
例句：They were blocked from joining the club.
他们被阻加入该俱乐部。

9. hostility n.敌意, 敌对状态；战争行动, 战斗
例句：There is open hostility between the two leaders.
两位领导人表现出公开的敌意。

10. supervise vt. 监督, 管理
例句：The architect supervised the building of the house.
建筑工程师监督房子的施工。