局部双向交流 partial two-way communication

双向外部性 Reciprocal externality

双向内部通讯系统 two way intercom system

双向内部通话装置 two-way intercommunication system

软腭部反向双z瓣 double traversing z-plasty

顶部双日转向 two-day reversal top

双向/面部-地板位置 Bi-level/face-floor position