奥巴马：伊核问题外交空间正缩小

2. stark adj. 严格的;刻板的
例句：The young man is faced with a stark choice.
这位年轻人面临严峻的抉择。

3. evade vt. 逃避; 回避
例句：If you try to evade paying your taxes you risk going to prison.
如果你试图逃税, 你就有坐牢的危险了。

4. obligation n. 义务;责任
例句：You are under no obligation to buy the house if you have not signed a purchase agreement.
如果你没有签订购买合同,就不一定非买这房子不可。

5. seize v. 抓住(时机等),利用
例句：He seized the chance of a trip to Singapore.
他抓住那次去新加坡旅行的机会。

6. persuade vt. 说服,劝服
例句：The salesman persuaded us to buy his product.
那个推销员说服了我们买他的产品。

7. plummet vi.垂直落下, 骤然跌落
例句：House prices have plummeted in this area.
此地房价骤然大跌。

8. ambition n. 抱负, 雄心, 野心
例句：His ambition knows no limits.
他的野心是无止尽的。

9. diminish v. (使)减少; 缩小
例句：We should try to diminish the cost of production.
我们应尽力减少生产成本。

10. standoff n. 僵持;均衡
例句：The political standoff ended when the army took over.
军队接管后,政治僵局才告一段落。