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| 51. | gyro compass system |
| 陀螺罗经系统 |
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| 52. | Children love to spin tops. |
| 孩子们爱抽陀螺。 |
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| 53. | The top sleeps. |
| 陀螺定转。 |
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| 54. | gyro pickoff angle |
| 陀螺传感角度 |
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| 55. | gyro-magnetic compass |
| 陀螺磁罗盘 |
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| 56. | gyro compass alignment |
| 陀螺罗经校准 |
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| 57. | gyro horizon |
| 陀螺地平仪 |
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| 58. | gyro erectional navigation |
| 陀螺光学导航系统 |
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| 59. | gravity controlled gyro |
| 重力控制陀螺 |
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| 60. | gyrocompass bearing |
| 陀螺罗方位 |
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