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| 周期性函数 | |||
| 周期函数 | |||
| periodic function: 23 phrases in 8 subjects |
| Air defense | 2 |
| Business | 2 |
| Economy | 1 |
| Electronics | 3 |
| Oil / petroleum | 2 |
| Physics | 1 |
| Space | 1 |
| Technology | 11 |
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