笼箱外形类似于椎间螺纹穿通融合器（TFC） ，上、下两面具有螺纹，在两侧有切口弹簧，内腔似扁橄榄形；
The cage with flat olive bore looks similar to the contour of the Ray-TFC, and has grooving spring on lateral sides.
笼箱外形类似于椎间螺纹穿通融合器（TFC） ，上、下两面具有螺纹，在两侧有切口弹簧，内腔似扁橄榄形；
The cage with flat olive bore looks similar to the contour of the Ray-TFC, and has grooving spring on lateral sides.
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