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positive period | |||
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positive period |
正周 期: 23 phrases in 12 subjects |
Business | 4 |
Earth sciences | 2 |
Economy | 1 |
Electric machinery | 1 |
Electronics | 3 |
Hydroelectric power stations | 1 |
Information technology | 2 |
Nursing | 1 |
Oil / petroleum | 1 |
Space | 2 |
Technology | 4 |
Wind Energy | 1 |