MA XUEJING/CHINA DAILY
The year 2020 has been an annus horribilis for the world economy, global health－and Sino-US relations. Bilateral relations further deteriorated due wholly to the United States hostile trade and security policies toward China.
US Secretary of State Mike Pompeo s statement during an interview on Aug 31 is an apt example of why Sino-US ties have deteriorated: Look, not every Chinese student who is here is working on behalf of or at the behest of, the direction of the Chinese Communist Party, but it s something President Trump has taken a serious, serious look at.
In line with Pompeo s remarks, some universities in the US either asked some Chinese students and researchers to leave or expelled them, with the University of North Texas in Denton expelling 15 visiting scholars from China in late August.
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The underwater chorus of killer whales or dolphins could contain secret military messages hidden in plain sound. Chinese researchers have recently published a series of studies describing how to disguise underwater communications as artificial dolphin clicks and killer whale songs, potentially allowing stealthy submarines or underwater drones to cryptically pass covert military communications between each other or a home base.
Mimicking marine mammal sounds to disguise military communication is a decades-old idea that has resurfaced. During the Cold War’s geopolitical rivalry between the United States and the Soviet Union, the US military’s Project Combo tested using recordings of whale and dolphin songs as the basis for secret code that might go unnoticed by enemy eavesdroppers. But the Chinese researchers’ efforts seem to have gone a step beyond, by using modern technology to create artificial whale and dolphin sounds from scratch rather than relying on pr