An overseas Chinese investor may apply for the visa valid for multiple entries and exits or apply for long-term residence.

华侨投资者，可以申请办理多次出入境有效签证和长期居留手续。

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Student's spouse or their pre-school children can apply for the single entry visa valid for up to 1 year and the validity cannot be longer than that of student's visa.

第十条、 留学生的配偶和学前子女等家属可申请签发有效期一年以内的一次签证，但有效期不能超过学生签证的有效期限。

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You don't want to get to your destination only to find you have the wrong visa, or worse, that your passport isn't valid any more.

你不会想要等到了你的目的地却发现你带的是错误的签证，或者更糟糕的是，你的护照不再有效。

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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

The Department of Homeland Security will "effective immediately" verify that every international student visa is valid, according to an internal memo obtained by the Associated Press news agency on Friday.

BBC: US tightens student visa rules after Boston bombing

Among the plaintiffs is Manuel Ortega Melendres, a visitor to Arizona who possessed a valid visa.

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In December 1996 he reportedly spent six months in Russian custody after he was caught without a valid visa in Chechnya.

BBC: NEWS | Middle East | Profile: Ayman al-Zawahiri