短语讲解:
1. And that prevents him from starting a presidential campaign, he said.
prevent from 阻止, 防止
例句:We must take steps to prevent this from happening again.
我们一定要采取措施,使这样的事不再发生。
2. At the age of 29, Joseph Biden was elected to the U.S. Senate.
at the age of 在…岁时
例句:He learned to ride a horse at the age of nine.
他九岁时学会了骑马。