重点讲解：
1. order sb. to do sth. 命令，要求，指示（某人做…）；
例句：Williams ordered him to leave.
威廉斯命令他离开。
2. be known for 以…闻名的；
例句：The fox is known for its cleverness and cunning.
狐狸的机敏和狡猾是人所共知的。
3. urge sb. to do sth. 敦促；力劝；
例句：We urge colleges and universities to demystify the selection process.
我们敦促各学院和大学澄清其甄选学生的过程。
4. clean up 清理，清除（污染物）；
例句：The mayor is determined to clean up the city.
市长决心清除市内的不良现象。
