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| 21. | The car ran down the hill under its own impetus. |
| 汽车借着本身的冲力滑下山。 |
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| 22. | Birds fly over the sea. |
| 鸟在海上飞翔。 |
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| 23. | Motion produced by an impelling force;momentum. |
| 冲力驱动力引发的移动；动力 |
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| 24. | Swallows put up very good flight performances. |
| 燕子飞翔婀娜多姿。 |
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| 25. | I am flying, I am flying like a bird, cross the sky. |
| 我在飞翔，如鸟般飞翔，划过长空。 |
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| 26. | The Cranes Are Flying |
| 飞翔的鹤 |
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| 27. | high-speed hovercraft |
| 高速飞翔船 |
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| 28. | Impetus of a physical object in motion. |
| 冲力运动中物体的动力 |
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| 29. | as the rock rolled down, it gathered momentum. |
| 岩石滚下山坡时，冲力愈来愈大。 |
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| 30. | The birds rose and dipped in their flight. |
| 鸟上下飞翔。 |
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