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31. | The White Balloon |
| 白气球 |
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32. | balloon astronomy |
| 气球天文学 |
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33. | balloon broadcasting |
| 气球广播 |
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34. | obstruction ballon |
| 拦阻气球 |
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35. | balloon fill up |
| 气球鼓起来 |
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36. | Balloon for correction |
| 校正气球 |
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37. | registering balloon |
| 探测气球 |
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38. | Trial Balloon |
| 试探性气球 |
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39. | prick a balloon |
| 刺穿气球 |
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40. | plastic balloon |
| 塑料气球 |
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