背景介绍在现代社会中，越来越多的人希望能够出国旅游、学习甚至工作。而要实现这个目标，最先要克服的障碍就是签证。然而，在申请签证的过程中，很多人都会面临瓶颈和挫折，甚至失去信心。对于签证的申请者来说，办理签证是一项重要的决策，...

IntroductionSince the outbreak of COVID-19 in early 2020, many countries have closed their borders and implement...

IntroductionMany countries have started to refuse to issue visas to individuals who are considered a threat to n...