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| 封闭式生态系统 | |||
| 密闭生态系统 | |||
| 封闭的生态系 (统); 闭路生态学系统; 闭合生态系统 | |||
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closed ecological system : 5 phrases in 3 subjects |
| Aviation | 1 |
| Space | 3 |
| Technology | 1 |
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