重点讲解：
1. be aimed at 旨在；目的是；
These measures are aimed at preventing violent crime.
这些措施旨在防止暴力犯罪。
2. participate in 参与；参加；
Over half the population of this country participate in sport.
这个国家一半以上的人口参加体育锻炼。
3. in recognition of 赞誉；赏识；奖赏；
He had just received a doctorate in recognition of his contributions to seismology.
他刚被授予了博士头衔以表彰他对地震学作出的贡献。
4. ahead of （竞赛中）领先于，超过；
Millar finished 1 minute and 35 seconds ahead of Thierry Claveyrolat.
米勒领先蒂埃里·克拉韦罗拉1分35秒完成比赛。

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