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2. spearhead vt. 当…的先锋, 带头
例句：He is spearheading the peace movement.
他充当这次和平运动的先锋。

3. transform v. 改变
例句：Marriage has completely transformed her.
结婚使她完全改变了。

4. invaluable adj. 无法估计的, 非常宝贵的,极有用的,无价的
例句：A computer would have been invaluable for this job.
一台计算机对这个工作的作用会是无法估计的。

5. reduce vt.缩减, 减少; 降低
例句：The driver reduced the driving speed.
司机减低了车速。

6. empower vt.授权, 准许
例句：The new law empowered the police to search private house.
新法律给予警察搜查私人住宅的权利。

7. assurance n.保证, 担保, 确信；把握, 信心；(人寿)保险
例句：She gave repeated assurances of her loyalty.
她反复保证她的忠诚。

8. scenario n. (行动的)方案,纲要;(对可能出现的情况的)描述,推测
例句：In a worst-case scenario, the disease will reach epidemic proportions.
最坏的情况是这种病流行开来。

9. 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。

10. limit vt.限制; 限定
例句：He must limit the number of cigarettes he smokes.
他必须限制他抽烟的数目。