1. There are twenty pupils in the class.
    这班上有二十个学生。

2. The boss offered twenty thousand N T to thank me, but I refused to accept it.
    老板拿出两万元台币要谢我, 但是我拒绝接受.

3. They stayed underground for twenty minutes and waited for the siren to sound again.
    他们在地下呆了二十分钟,等候警报器再一次响起.

4. There are twenty apples in the basket.
    筐里有二十个苹果.

5. The most economical age to capture an elephant for training is between fifteen and twenty years,
    捕捉15至20岁之间年龄的大象进行驯象最为经济。

6. Twenty or thirty pages of information handed to any of the major world powers around the year 1925 would have been sufficient to change the course of world history.
    如果把二三十页的情报交给1952年前后的任何一个世界强国，就足以改变世界历史的进程。二三十页材料中的思想和情报会便当今的世界翻天覆地，甚至毁灭这个世界。

7. The man who manoeuvres carelessly into his twenty pounds´ worth of space at one of Europe´s myriad permanent sites may find himself bumping a Bentley.
    如果一位游客漫不经心地驾车驶入欧洲无数常年营地之一，花20镑租用一个空位，那么他可能会碰见一辆本特利汽车，

8. The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
    而开发这样一台望远镜将会是21世纪天文学的一个重要的研究课题。

9. Twenty people had already left.
    有20个人已经离去。

10. Then in 1989, twenty-six years after the crash, the plane was accidentally rediscovered in an aerial survey of the island.
    于是，到了1989年，飞机失事26年后，在对小岛的一次航空勘查中那架飞机被意外地发现了。