指环由两个环体组合而成，每个环体与一个笼体结合为一体构成 架体，两个架体中部用铰轴连接在一起。
The ring comprises another two independent rings, each of which integrates with an independent cage into a frame, and the two frames are connected with cardinal axis in the middle.
指环由两个环体组合而成，每个环体与一个笼体结合为一体构成 架体，两个架体中部用铰轴连接在一起。
The ring comprises another two independent rings, each of which integrates with an independent cage into a frame, and the two frames are connected with cardinal axis in the middle.
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