One- third of these degrees (33.1 %) went to temporary visa holders, up from 23.3% in 1998.

根据美国国家科学基金会的调查，美国颁发的博士学位数字已经连续6年上升，达到2008年创纪录48802个，其中约三成的博士持有临时签证，这和1998年的23.3％比例相比有所上升。

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Your temporary visa will only be valid for 30 days once you receive it and you will need to travel within this period.

在您获得临时签证页时，该签证页的有效期只有30天，而您需要在此期间前往英国。

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Migrants are not entitled to any of the social services that urban residents get unless they convert their temporary visa to permanent residency, something that is exceedingly hard to do.

进城务工农民和城市居民享受到的所有社会服务无缘，除非他们能将他们的临时户口转成永久城镇户口。这个很难。

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Right now, dairy farms are ineligible for the temporary visa program, called H-2A, which is only for seasonal workers.

WSJ: Schumer: Immigration bill helps Northeast farmers

That would allow the entrepreneur to enter the United States or adjust status if here on a temporary visa.

FORBES: Want More Jobs? Then, We Need More Startups

It is virtually impossible to use a temporary visa in America to legally hire a foreign national long-term for such jobs.

FORBES: Only Takes 2,000 (or 3,000) Pages to Explain U.S. Immigration Rules