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| 1. | Nose-dive; plummet |
| 暴跌 |
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| 2. | His comprehensive（全面、广泛、能全面理解、包容） apprehension（理解、拘捕） about the appendix of the pendulum（钟摆） is obvious |
| 他对钟摆的附属品的全面的理解是很明显的。 |
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| 3. | optical plummet |
| 光学锤准器 |
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| 4. | pendulum module |
| 钟摆组件 |
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| 5. | a clock weight |
| 钟摆 |
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| 6. | inverse plummet observation |
| 倒锤线观测 |
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| 7. | optical plummet centring |
| 光学垂线对中 |
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| 8. | laser plummet apparatus |
| 激光铅垂仪 |
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| 9. | direct plummet observation |
| 正锤线观测 |
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| 10. | pendulum principle |
| 钟摆原理 |
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