Passport, valid at least 90 days after expiration of the visa, with a photocopy of the identity page.

护照要签发签证有效期后需仍有九十天有效时间。

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A double entry visa is valid for 3 to 6 months with duration of each stay 30 days.

两次入境签证有效期一般为三至六个月，每次停留期为30天。

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from Europe with a valid entry visa. Umar Farouk Abdulmutallab's name should have come up on a computer screen.

VOA: standard.2009.12.28

It stipulates that you have to be a STEM graduate (Science Technology Engineering or Mathematics) with a valid visa within a year of graduation or with a H1-B Visa to qualify.

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"The fact that a foreign national was able to re-enter the U.S. with what appeared to be a valid student visa, while Customs and Border Protection officers were unaware that his visa status had become invalid, represents a serious hole in our national security, " McCaul told CNN.

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