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| 81. | hyperboloid of revolution |
| 回转双曲面 |
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| 82. | period of revolution |
| 回转周期 |
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| 83. | swiveling speed |
| 回转速度 |
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| 84. | integrating gyroscope |
| 回转积分器 |
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| 85. | rotary vibration |
| 回转振动 |
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| 86. | quafric of revolution |
| 回转二次曲面 |
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| 87. | throw-over catch |
| 回转挡 |
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| 88. | rotary type agitator |
| 回转搅拌器 |
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| 89. | radial butt coupler |
| 回转车钩 |
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| 90. | rotary flash lamp |
| 回转闪光灯 |
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