（81）英国W·瓦特于1935年成功地研制出世界上第一部探测飞机用的实用雷达。（82）中国无线电学家谭玉田于1936年7月在南京公开表演无线电遥控船模型。同年，美国贝尔研究所成功研究出声码器；中国青年电子科学家孟昭英博士在美国发明了世界上最小的真空管，促进了超短波的发 (81) W · Watt in the United Kingdom in 1935 successfully developed the world’s first practical radar used to detect aircraft. (82) Chinese radio scientist Tan Yutian performed a model radio remote control ship in Nanjing in July 1936. In the same year, the Bell Institute of the United States successfully developed a vocoder. Dr. Meng Zhaoying, a young Chinese electronic scientist, invented the smallest vacuum tube in the world and promoted the development of ultra-short wave