重点讲解：
1. serve as 用作；可当…使用；充作；
He volunteered to serve as the manager of our department store.
他自荐当我们商场的经理。
2. participate in 参与；参加；
No professionals may participate in the amateur tennis tournament.
任何职业选手均不得参加业余网球锦标赛。
3. compared with 与…相比；和…比起来；
Overall industrial production was up compared with last year.
与去年相比，整个工业产值上升了很多。
4. on record 有记录的；有记载的；
It has been one of the hottest summers on record.
这是有史以来最热的夏季之一。