Many countries require you to have a valid visa before arriving.

到达目的地前，很多国家会要求你先办好有效的签证。

youdao

XIAO QIN: "Obviously, we prefer to stay here for several years, but if we cannot get any valid visa we have to leave."

XIAO QIN：“显然，我们更愿意在这里停留数年，但如果我们不能得到任何有效的签证，我们不得不离开。”

youdao

After all, the police said the suspected British man involved in the incident does have a valid visa. But why start the crackdown now?

而且警察说，此事件中的英籍男子确有合法签证，但是，为什么要在现在清理呢？

youdao

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

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

CNN: SHARE THIS

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

Plaintiff Manuel Ortega Melendres was vising Arizona on a valid visa.

CNN: Federal judge says Arizona sheriff was racially profiling