A positively-negatively tapered helix TWT were designed and fabricated.The results show that the measured efficiency of the tapered TWT reaches 29%, while that of the non-tapered TWT is 19%.是什么意思_A positively-negatively tapered helix TWT were designed and fabricated.The results show that the measured efficiency of the tapered TWT reaches 29%, while that of the non-tapered TWT is 19%.在线翻译_英语_读音_用法_例句