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| 11. | What caused the balloon to plummet? |
| 是什么原因致使气球骤然跌落下来了呢？ |
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| 12. | The pendulum swings. |
| 钟摆摆动。 |
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| 13. | pendulum technique |
| 钟摆技术 |
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| 14. | Back and forth swung the pendulum. |
| 钟摆来来回回地摆动。 |
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| 15. | The Pit and the Pendulum and Other Stories |
| 陷井和钟摆 |
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| 16. | the swinging of the pendulum |
| 钟摆的摆动 |
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| 17. | A pendulum swings back and forth. |
| 钟摆前后摆动。 |
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| 18. | To drop sharply and rapidly; plummet |
| 急剧下跌;骤降 |
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| 19. | the stroke of a pendulum. |
| 钟摆的摆动 |
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| 20. | The pendulum swung back and forth. |
| 钟摆来回地摆动。 |
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