Ultrasonic speakers are lowered into the sea to test if they scare fish away
In total there are 10 separate investigations – or modules as they are called. So far only two, looking at pandemic preparedness and government decision-making, have been completed.，推荐阅读Line官方版本下载获取更多信息
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Author(s): Aojie Li, Han Hu, Tao Guo, Ruochen Sun, Mao Ye, Feng Tian, Yi Liu