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重点讲解：
1. be rich in 富含...
Oranges are rich in vitamin C.
橘子含有丰富的维生素C。
2. little by little 逐渐地
That ship sank little by little.
那只船渐渐地沉下去。
3. date back 追溯
Graffiti, soccer hooliganism, and street brawling all date back decades.
涂鸦、足球流氓和街头闹事都可追溯到几十年前。
4. in power 执政的；掌权的
If he thinks he can remain in power by force, he is courting disaster.
如果他认为可以通过武力维持权力的话，那就是在招灾惹祸。
