翻译一篇英文新闻报道。
原文文章： 
Global travel is facing strong headwinds as the Delta variant of Covid-19 spreads. Countries in Europe and Asia are once again imposing travel restrictions and measures such as quarantine, testing or outright bans on visitors from other countries to try to limit the spread of the virus. Many cruise lines and airlines have suspended or canceled itineraries in affected regions. Meanwhile, concerns about the slow pace of vaccination in many parts of the world, particularly in developing nations, are also weighing on travel demand.
随着COVID-19的Delta变种传播，全球旅行面临着巨大的阻力。欧洲和亚洲国家再次实施旅行限制措施，例如检疫，测试或针对来自其他国家的访问者的明确禁令，以试图限制病毒的传播。许多游轮公司和航空公司已经暂停或取消了受影响地区的行程。同时，许多地区，特别是发展中国家，疫苗接种进展缓慢的担忧也影响了旅行需求。