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重点讲解：
1. on a diet （为减轻体重的）限制饮食，节食；
Have you been on a diet? You've lost a lot of weight.
你最近在节食吗？你瘦了好多。
2. take part in 参加；参与；
They returned to take part in the season's opening game.
他们回来参加本赛季的开幕赛。
3. lose weight 体重减轻；
Some people can diet like crazy and not lose weight.
有些人拼命节食也不能减肥。
4. in the hopes of 怀着（…发生的）希望；
A new study shows that pigeons will also pass up a sure thing in the hopes of a big payoff.
一项新研究显示，鸽子也会为了获得更大的回报而放弃一些近在眼前的好处。
