Lesson 1:
1. break a record “打破记录”；keep a record “保持纪录”
2. win a gold medal “赢得一枚金牌”
3. At the Olympics, athletes compete for medals.
compete for / to do sth. “为（做）某事而竞争”
4. At the opening event of the 1984 Olympics, he won a gold medal in shooting.
在具体哪一年的奥运会上用介词at，在哪一个比赛项目中用介词in。
