教学建议

本单元重点例句及相关知识的讲解

1. I saw many old inventions on show.

我看到了许多古老的发明物在展览。

on show意思是“陈列，展览”。on表示“处于某种状态中”。show在此作名词用，与on构成短语，on + 名词还有

on duty(值日)，

on sale(出售)，

on business(出差)，

on leave(休假)等。例如：

There are a number of model cars on show in the museum. And some of the old things are on sale now. She went to Beijing on business last week. Her assistant is on leave now. She could show you around next week.

在博物馆里有许多模型汽车展出，现在有些古老的东西正在出售。上周她到北京出差去了，她的助理也正在休假。她下周可以带你转转。

2. They were all invented hundreds of years ago.

它们都是几百年前发明的。

Hundreds of… 意思是“数以百计的，成百上千的”。hundreds, thousand, million等词与of一起用时，表示不定量的数目，必须用复数形式，而且前面不能有具体的数字。例如：

He has received thousands of letters. Hundreds of people are still waiting for him.

他收到了成千上万封信。数以百计的人还在等他。