重点讲解：
1. according to 依照；按照；根据；
They both played the game according to the rules.
他们俩都依章行事。
2. at the invitation of 获得邀请；
They came to Washington at the invitation of the president.
他们应总统的邀请来到了华盛顿。
3. be willing to do sth. 乐意的；愿意的；
While I am willing to help, I do not have much time available.
尽管我愿意帮忙，但是没有多少时间。
4. engage in 参与；从事；
Nowadays, office workers rarely engage in regular exercise.
现在，上班族很少定期进行锻炼。

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