How to extend a visa if it expires?

签证到期后怎样延长签证？

youdao

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。

youdao

If your company, for example, has an annual service agreement for a particular application that you want to phase out, find out when the agreement expires as well as when it is renewed.

例如，如果公司具有您希望终止的特定应用程序的年服务协议，则应了解协议何时期满以及何时续订该协议。

youdao

If it expires with no successor lined up, some worry that global efforts to curb greenhouse gas emissions will fall apart.

FORBES: It's Crunch Time For Kyoto

If the domain name expires, SnapNames will buy it back on the current owner's or prospective owner's behalf.

CNN: New service back-orders domain names

Because it's not as if the whole Voting Rights Act expires anyway, because the whole act doesn't expire.

NPR: Roundtable: Voting Rights Act, NABJ Conference