1. 双闸门：double blade 双刀片 | double gate 双闸门 | double nut 双螺母
2. 双选通 双闸：double-frequency sequence signalling system ==> 双频顺序信号制 | double-gate ==> 双选通,双闸 | double-gauss derivatives ==> 双高斯型物镜变型
3. 双控制极,双门：double gap cavity ==> 双隙缝谐振腔 | double gate ==> 双控制极,双门 | double Gauss lens ==> 双高斯镜头,双高斯透镜