双道梳棉纱 double carded yarn

双道腰子捆扎 With Double Straps

双道金属镶嵌法 dual damascene

双道滑梯美国 Little Tikes

双重道德标准 double moral standard ; Dual standard of morality

双车道 two-way traffic ; two-lane ; double lane

双边渠道 bilateral channels

双道天线收发转换开关 two-channel duplexer ; channel duplexer

双道打浆机 GFM-DFP