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| 51. | vibration rotation |
| 振荡转动 |
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| 52. | rotational level |
| 转动能级 |
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| 53. | rotational part |
| 转动部分 |
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| 54. | proper rotation |
| 固有转动 |
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| 55. | rotational structure |
| 转动结构 |
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| 56. | dead reduction drive |
| 减速转动 |
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| 57. | rotational wave |
| 转动波 |
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| 58. | arc of rotation |
| 转动弧 |
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| 59. | rolling transpositio |
| 转动换位 |
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| 60. | a rotating shutter |
| 转动快门 |
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