| 单词 | rotary movement |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔ball-and-socket joint〕A joint, as in a mechanical device, that permits rotary movement in all directions through the movement of a ball in a socket.球窝关节：一种接头，如在机械设备中，通过滚珠在承窝中的运动可做全方位的转动美国传统 |
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