1)Bidirectional Lines,双向线2)Cataract,双向线性3)two-way circuit,双向线路4)both-way line,双向线路5)two-way solenoid,双向线圈6)Two-way linear regression,双向线性回归7)2D linear extrapolation,双向线性外推8)two-way solenoid valve,双向线圈电磁阀9)bidirectional linear switched ring,双向线性倒换环10)two-fiber bidirectional linear switched ring,双纤双向线性倒换环