重点讲解：
1. learn about 得知；了解；
例句：I read Lives of the Poets and learned about the lives of many English poets.
我读了《诗人传》, 从中了解了许多英国诗人的生活。
2. more than 超过；超出；
例句：More than one person has been concerned in this.
不止一个人与这件事有牵连。
3. commission to 正式委托；委托（做）；
例句：You can commission them to paint something especially for you.
你可以委托他们专门为你画点什么。
4. an area of 面积；
例句：Rescue crews had scoured an area of 30 square miles.
救援人员已经搜遍了30平方英里的范围。
