主要特点：滚珠轴承，关灵活，无噪音，寿命长。
FEATURES: Ball bearing, switching flexibility, no noise, long life.
一个关脑灵活反应快的小孩子很聪明，可是他不是知识分子。
A small child with a clever quick mind is intellectual, but he isn't an intellectual.
它具有优良的工程性质，包括平衡力量，灵活性和良好的韧性和耐磨性与PA 6相关的自润滑性能相结合。
It exhibits excellent balance of engineering properties including strength, flexibility, and toughness combined with excellent abrasion resistance and self-lubricating properties associated with PA6.
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