n.滑轮，铰链
pivot
A point or circumstance on which subsequent events depend.
A jointed or flexible device that allows the turning or pivoting of a part, such as a door or lid, on a stationary frame.
Synonyms: articulation, axis, ball-and-socket, butt, elbow, hook, joint, juncture, knee, link, pin, spring, swivel, turning point
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