[4] Live bird migration maps. https://birdcast.info/migration-tools/live-migration-maps/ [5] 《天气雷达如何监测空中生物》。https://www.cma.gov.cn/2011xzt/2022zt/20220330/2022033007/202209/t20220920_5095295.html [6] Radar, Part 1: How Radar Works. https://www.e-education.psu.edu/meteo...