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不 定期的 : 21 phrases in 11 subjects |
| Advertising | 1 |
| Business | 1 |
| China | 2 |
| Economy | 4 |
| Finances | 1 |
| General | 2 |
| Hydroelectric power stations | 2 |
| International trade | 3 |
| Materials science | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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