不仅是病毒，还有其他风险。诸如成为人质，外交筹码。

来源: 于 2021-04-20 14:10:44 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

There are currently around three dozen countries with the State Department's Level 4: Do Not Travel alert -- the highest of the travel advisory levels. US citizens are warned against traveling to those countries for a variety of reasons, including Covid-19, crime and civil unrest.