operational systems
| development
| operational system | |
| tech. | 运行系统; 操作系统 |
| development | |
| met. | 研制; 改进; 发达; 扩展; 产生; 显像 |
| |||
| 运行系统; 操作系统 | |||
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operational systems : 186 phrases in 23 subjects |