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| 恒流泉; 永久的源泉 | |||
| 稳定源 | |||
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| 稳定源 | |||
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постоянный источник : 21 phrases in 5 subjects |
| Aviation | 1 |
| Electronics | 10 |
| General | 5 |
| Hydraulics | 1 |
| Technology | 4 |
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