Seventeen states allow parents to get an exemption.
有17个州允许家长免接种疫苗。
Seventeen states allow parents to get an exemption, sometimes just by signing a paper saying they personally object to a vaccine.
17个州允许父母获得豁免，有时他们只需要签署一份文件，以此声明他们反对接种疫苗。
The National Council on economic Education has found that seventeen states now require high school students to take a class in economics. This number has grown from thirteen in 1998.
全美经济教育协会发现，17个州现在要求中学生上经济课，而在1998年只有13个州这样做。
He emigrated to the United States when he was seventeen years old, and was naturalized on his twentieth birthday.
他十七岁时移居美国，二十岁生日时就入籍了。
Asking a favor of the President of the United States was no casual matter, especially for a seventeen-year-old girl.
请求美国总统的帮助不是一件随便的事，尤其是对一个17岁的女孩来说。
Seventeen of the tallest mountains in the United States are in Alaska. They include the tallest mountain in North America.
美国十七座海拔最高的山都在阿拉斯加，这些山包括北美最高的山--麦金利山，其海拔近6200米。
For example, the Web site petswelcome.com lists more than seventeen thousand pet friendly hotels, campgrounds and beaches in the United States.
例如，petswelcome.com网站就列举了美国有17000多家接纳宠物的宾馆、野营地和海滩。
Patent lawyers recommended the use of what are called improvement patents, by which the life of a patent-in the United States, its life is seventeen years-could be extended almost indefinitely.
专利律师推荐使用改进专利，它在美国的专利年限为17年，并可以几乎可以被延长至无限期。
Over the past three and a half decades, real per-capita income in the United States has risen from just over seventeen thousand dollars to almost twenty-seven thousand dollars.
过去35年来，美国人均真实收入从1.7万美元出头直升至将近2.7万美元。
Rowling clearly states in Chapter Seventeen that Gryffindor played and lost a match to Ravenclaw, since Harry was unconscious at the time.
之后罗琳女士清楚地在第十七章中说明了格兰芬多和拉文·克劳比赛了而最终输了，因为那时哈利还不醒人世。
Rowling clearly states in Chapter Seventeen that Gryffindor played and lost a match to Ravenclaw, since Harry was unconscious at the time.
之后罗琳女士清楚地在第十七章中说明了格兰芬多和拉文·克劳比赛了而最终输了，因为那时哈利还不醒人世。
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