The US State Department on Friday issued an expanded health alert for China over concerns for the safety of US personnel in the country following reports of a series of mysterious acoustic incidents.
원문출처 : https://www.cnn.com/2018/06/08/asia/china-acoustic-us-health-alert-intl/index.html
원문출처 : https://www.cnn.com/2018/06/08/asia/china-acoustic-us-health-alert-intl/index.html