Rodents had overrun a posh private school near New York City. So the headmaster, a friend of mine, asked a health inspector to deliver a slide presentation to teachers and students, showing how to remedy the situation, i.e., stow trash, no food in class, etc.

　　The following day, a teacher had her very young children write a letter to the inspector, thanking him for the visit. One of the students wrote, "Dear Mr. Johnson, Thank you for coming to my school. Until I saw you, I didn't know what a rat looked like."

　　啮齿类动物在纽约市附近的一家时尚的私立学校泛滥成灾。 那家学校的校长（我的一个朋） 请来了一位健康检查员来给在校师生作一次幻灯演示，告诉他们如何处理这种情况，如，要垃圾装好，上课不能吃东西等等。