例句：
They refused him a visa.
他们拒绝给他签证。
The passports, with the visa stamps, were waiting at the embassy.
护照都加盖了签证章，在大使馆等待领取。
They overstayed their visa.
他们居留超过了签证期限。
They thought that their relatives would be able to fix the visas
他们以为他们的亲戚们会把签证办好。
He had wangled his way into the country without a visa
他在没有签证的情况下设法混进了那个国家。