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释义	dashed circle 虚线圆
随便看	optical cavity mode optical cavity modes Optical CDMA optical-CDMA Optical CDMA Technology optical celestial navigation optical cell optical cement optical cements and adhesives opticalcenter optical center optical centering optical centering and edging optical centering device optical center of lens optical center of the registering frame optical centers optical centers of lens optical centre optical centre of lens Optical centring optical centring device optical ceramics optical change optical change-over assembly