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重点讲解：
1. dedicate to 献(身)；投(身)；致力；
Bessie has dedicated her life to caring for others.
贝茜一生都致力于照顾他人。
2. serve as 用作；可当…使用；充当；
He has also served as a prime minister and Supreme Court justice.
他也曾当过总理和最高法院的大法官。
3. be determined to do sth. 下定决心的；决意的；坚定的；
We are determined to get the work done before New Year's Day.
我们定下决心，要在元旦前完成这项工作。
4. tend to do sth. 往往会；经常就；
We tend to make mistakes when we do things in a hurry.
忙中不免出错。
n. 范例，示范，典范，[语]词形变化表
