魔方故障是指魔方在比赛中发生的故障，如：飞棱、魔板线断裂，螺丝钉、中心盖、贴纸等脱落；
Puzzle defects are defects of puzzles, like: pieces popping, wires breaking, screws/caps/stickers falling off.
该组合螺丝具有易于加工、使用方便、防脱落松动效果好的特点。
The combined screw has the advantages of the easy processing, the convenient use and the good drop-proof and loose-proof effects.
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