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31. | Swallows fly about, carefree and at liberty. |
| 燕子自由自在地飞翔。 |
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32. | Birds fiy in the air. |
| 鸟儿在天空飞翔。 |
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33. | Kites are gliding in the air. |
| 风筝在空中飞翔。 |
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34. | Birds are flying high up in the air. |
| 鸟儿在高空中飞翔。 |
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35. | To Fly Like the Birds. |
| 像鸟一样飞翔。 |
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36. | The act of flying; flight. |
| 飞飞的动作;飞翔 |
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37. | impulse steam turbine |
| 冲击式汽轮机;冲力式蒸汽轮机 |
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38. | to study the flight of birds |
| 研究鸟的飞翔 |
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39. | airplanes are flying in the vast sky. |
| 飞机在长空飞翔。 |
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40. | No flying without wings . |
| 无翅膀,休飞翔。 |
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