tenure
n. 任期
eg. She felt the insecurity of her tenure of her brother's hospitality.
她感到，她在她弟弟府上的居留权已朝不保夕。

curriculum
n. 课程
eg. We shall have to design a new curriculum for the third year.
我们得设计出三年级的新课程。

be dedicated to
致力于，献身于
eg. The monument be dedicated to the memory of the national hero.
这座碑是为纪念那位民族英雄而建造的。

prevalence
n. 普遍，流行
eg. The prevalence of cigarette smoking was much higher in lower social groups.
吸烟在低层社会群体中更为盛行。

scarity
n. 不足；缺乏
eg. Firewood scarity offers the most visible and dramatic example of deforestation's effects.
薪材短缺是毁林后果的最明显和最引人注目的实例。

rhetorical
adj. 修辞的
eg. The Grand Design reached its rhetorical apogee.
宏伟计划达到口头上的高潮。