expensive.

5. tens of thousands of 数以万计的

　　Tens of thousands of people were watching the game in the stadium when it began to rain heavily.

　　拓展：

　　hundreds of数百的

　　hundreds of and thousands of 成百上千的

　　thousands of数千的

　　millions of数百万的

　　dozens of许多； 大量

　　scores of 许多； 大量

　　考点例题；

　　Every year ________ foreign visitors come to China.

　　A. tens of thousands of B. ten thousands of

　　C. over ten thousands D. thousands upon thousands

　　There were ____________ people in the hall.

　　A. two scores of B. scores of

C. two and score D. two scores

6. be known/well known as = be famous as作为......而出名

　　Shenzhen is well-known as a modern city.

　　拓展：

　　be known for因为......而闻名

　　be known to sb.为......所熟悉

　　It is known (to all) that...众所周知......

　　As is known (to all), ....众所周知......

　　It is well-known to us all it is very important to keep the balance of nature.

=As is well-known to us all, it is important to keep the balance of nature.

7. break out(战争、火灾、疫病等)突然发生，爆发

　　A fire broke out in the supermarket last night.

　　拓展：

　　break down出毛病，不运转

　　break away from脱离，摆脱......

　　break in插话，破门进入

　　break into破门闯入

　　break off突然终止

　　break through突围，突破

　　考点例题：

The fire was put out 15 minutes after it _________________.

8. lose hope绝望

　　He never loses hope even when he fails.

　　拓展：

　　lose heart泄气；灰心

　　lose courage沮丧

lose face丢脸；受屈辱