bill, is a scientist. (bill 为插入成份)

2.　kent howard, my english teacher, is from america. (插入成份 my english
teacher)

3.　her father, who is a famous scholar, teaches english.(插入成份 who is a
famous scholar)

4.　eleanor, his wife of thirty years, suddenly decided to open her own
business. (试将插入成份 his wife of thirty years 去掉，句子是否也能成立？)
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2.3.4　句中的城市名如果和它的省、州、国名并列，省、州、国名前后须加逗号：

1.　we visited hartford, connecticut, last summer. (connecticut 为插入成份)
2.　paris, france, is sometimes called "the city of lights." (france 为插入
成份)
3.　hartford, connecticut's investment in the insurance industry is well
known.(connecticut's 为所有格式，后面不可加逗号喔)
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2.3.5　句中带着连接词(but, and, or...)的插入成份的前面不可加上逗号：

1.　the red sox were leading the league at the end of may, but of
　　 course, they always do well in the spring. (but

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