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航空条例
| 研究
| 教育中心
| 航空条例 | |
| econ. | navigation acts |
| environ. | air traffic regulation |
| 研究 | |
| gen. | investigate; investigation |
| environ. | research |
| hydroel.st. | study |
| met. | survey; testing |
| space | research, test, development and evaluation |
| 教育中心 | |
| tech. | educational center |
| |||
| navigation acts | |||
| air traffic regulation | |||
| navigation act | |||
| 航空条例: 18 phrases in 3 subjects |
| Aviation | 16 |
| Technology | 1 |
| United States | 1 |
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