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| wind measuring balloon | |||
| pibal; trial balloon | |||
| lost balloon | |||
| pilot balloon | |||
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| pibal | |||
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| pilot balloon (observation) | |||
| 测风 气球: 21 phrases in 10 subjects |
| Agriculture | 1 |
| Aviation | 2 |
| Desert science | 2 |
| Earth sciences | 2 |
| Electronics | 1 |
| French | 1 |
| General | 3 |
| Skydiving | 1 |
| Space | 2 |
| Technology | 6 |
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