Robert Fulton owned more than 70 legal documents that protected his inventions.
VOA: special.2009.01.14
One of my favorite stories is, William Ruckelshaus, William Ruckelshaus who was head of the Environmental Protection Agency in the early 1970s.
我最喜欢的一个故事,是讲,他是20世纪70年代时候的,环境保护机构的会长。
We have got an extensive subway system and an extensive bus system that we have had for 60, 70 years.
我们有大规模的地铁系统和巴士系统,它们已经有差不多六七十年的历史了。
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