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| 使用塔; 勤务塔 | |||
| 火箭勤务塔 (发射火箭前用的) | |||
| 建筑的垂直运输塔; 工作塔 | |||
| service tower: 13 phrases in 3 subjects |
| Aviation | 3 |
| Space | 9 |
| United States | 1 |
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