| |||
wind measuring balloon | |||
pibal; trial balloon | |||
lost balloon | |||
pilot balloon | |||
| |||
pibal | |||
| |||
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 |