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重点讲解：
1. name after (以…)为…命名；
The college is named after George Washington.
该大学以乔治·华盛顿的名字命名。
2. engage in 参与；从事；
You can engage in croquet on the south lawn.
你可以参加南边草坪上的槌球游戏。
3. bone up on 钻研学习；复习；
She had boned up on the city's history before the visit.
她在访问前对这座城市的历史先研究了一番。
4. work out 想出，得到(解决方法)；解(谜)；
It took me some time to work out what was causing this.
我花了一些时间才弄清此事的起因。
n. 刺激，激励，鼓舞
