句中in the years that followed可改成in the following years或in the next few years. 意思大致相同。
2) keep on doing sth.作“继续做某事”解，（=go on doing sth.= continue to do sth.= continue
doing sth.）例如：
Although he was tired , he kept on working. 虽然他很累了，但他继续工作。
注意：keep on doing和keep doing的区别，前者强调“继续做某事”，而后者常表示连
续不断的动作或持续的状态，即“不停地、不断地做某事。”例如：
He had a bad cold and kept coughing all day. 他患了重感冒，整天不停地咳嗽。
Be quiet: Don’t keep asking such silly questions. 安静点，不要老是问这么傻的问题。
9.In the 1870s, when Mark was already in his fifties, he found it important to study the situation in Russia. 在19世纪70年代，马克思已经50多岁了，他觉得研究俄国的形势很重要。
in one’s fifties指在某人50多岁时（50──59）。例如：
He became famous is his twenties. 他20多岁时就出名了。
When he was in his thirties, he went to the countryside and became a farmer.
当他30多岁的时候，他去了农村，当了一个农民。
The professor was an ordinary—looking little man is his sixties.
那位教授是一位60多岁，个子矮小，相貌平常的人。
2) 句中的it是形式宾语，真正的宾语是后边的动词不定式。此句型结构是“主语＋谓
语动词＋it＋宾补（形容词或名词）＋动词不定短语。常用于此种结构的谓语动词还有think、fell、make、consider等。例如：
I think it necessary to go there. 我认为到那儿去一趟很有必要。
We find it impossible to finish the work in ten minutes.
我们认为10分钟内完成那项工作是不可能的。
He feels it his duty to help those who are in trouble.
他感到帮助那些处于困境中的人们是他的责任。
10. In one of his books, Marx gave some advice on how to learn a foreign language.
马克思在他一本书中对如何学习外语提出了一些建议。
advice是不可数名词，不能用复数形式。如果说一条建议，则用a piece of advice, 二条
建议，two pieces of advice。advice前常用的修饰词有some、any、much、pieces of等。例如：
They gave some advice on our work. 他对我们的工作提出了一些建议。
You’d better ask for the teacher’s advice on our English study.
你最好去征求一下老师对我们的英语学习的意见。
You should follow／take your parents’ advice. 你应该听众你父母的劝告。
《高一英语第二十一单元(第2页)》出自：www.89xue.com网
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