慢速英语:Fewer US Students Are Ready for College

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1. release vt.释放; 发布; 发行
例句：He had won his first release from the fences of home.
他第一次成功地脱出家庭的樊笼。

2. decrease n.减少，减小; 减少量
例句：The decrease in unemployment was 30 percent.
失业人数减少了百分之三十。

3. redouble vt.进一步加强，大大增加
例句：We must redouble our efforts.
我们应该加倍努力.

4. sufficient adj.足够的; 充足的; 充分的
例句：Is the money sufficient to cover the tuition?
这笔钱付学费够吗?

5. motivation n.动机; 动力; 诱因
例句：His major worries were communication and motivation.
他主要的忧虑还是沟通和激励的问题。