1. Under the law, parents must teach their children, whether at school or at home.
    根据法律，家长必须教育孩子，不管是在学校还是在家里。

2. Uncle Sam soon replaced Brother Jonathan as American's most popular symbol.
    很快，山姆大叔就取代了乔纳森大哥，成了最受美国人欢迎的象征。

3. The growth of knowledge followed a kind of compound interest law,
    因为知识的增长遵循着一种"滚雪球"的规律。

4. Later, when night fell, Kaz and her brother made for the mountains; a friend from Kaz's factory lived in a village on the slope of a hill behind the city and had offered to take them in.
    接着，夜幕降临了，和子和她弟弟往山里走；和子厂里的一个朋友住在市区后面一个小山坡上的村子里, 表示愿意收留他们。

5. I identified the coat at once,it was my brother´s.
    我立即认出那件外衣,它是我兄弟的.

6. I had my photo taken by my brother.
    我要哥哥帮我照相.

7. If Nancy´s three year-old brother can read, he must be a precocious
    如果南茜三岁大的弟弟会读书，那他一定是个早熟的小孩。

8. I have just received a letter from my brother, Tim.
    我刚收到我兄弟Tim的信.

9. Who rolled balls down inclined planes, and then generalized the results of his many experiments into the famous law of free fall.
    他是那个使地球体沿斜面向下滚动，然后将多次实验结果概括成著名的自由落体定律的人。

10. I have just received a letter from my brother, Tim.
    我刚刚收到弟弟蒂姆的来信，