How to extend a visa if it expires?

签证到期后怎样延长签证？

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I want to take advantage of this coupon before it expires.

我想在这个优惠券到期之前把它用了。

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If an LTPA token is successfully captured, the thief can impersonate the user identified until it expires.

如果ltpa令牌被成功截获，则窃取者可以模拟该用户的身份，直到它到期为止。

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While in opposition, the Democratic Party of Japan tried to block the country's Indian Ocean refueling mission for U.S.-led forces in Afghanistan, but agreed not to disrupt the mission before it expires in January.

VOA: standard.2009.08.31

Derek Bonnard has been told his contract will not be renewed when it expires in September.

BBC: Derek Bonnard to leave Cleveland Police

It expires on June 30th and without it no one will negotiate with him.

ECONOMIST: It is make-or-break time this spring for global trade talks

After it expires it is far to expensive to get another term policy if you are even insurable.

FORBES: 3) Do the tax benefits outweigh the costs?