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| периодически; нерегулярно; варьирующийся интервал | |||
| неопределенное время | |||
| 不定时: 36 phrases in 8 subjects |
| Aviation | 1 |
| Economy | 1 |
| Electronics | 4 |
| General | 18 |
| Information technology | 1 |
| Medical | 1 |
| Psychology | 1 |
| Technology | 9 |
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