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| 定期; 按时; 间歇地 | |||
| 周期地 | |||
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periodically loaded waveguide : 22 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Electronics | 4 |
| Nautical | 4 |
| Polymers | 1 |
| Project management | 2 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 7 |
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