gradual change短语⁴⁹⁴⁸⁶ 基本例句 渐变 The input and output use the standard rectangle wave- guide, the transition between rectangle wave- guide and fin-line is continuous gradual change line, and it has good capability of matching. 开关的输入、输出使用标准矩形波导，鳍线和矩形波导之间采用连续渐变线进行过渡，匹配性能良好。 cnki