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| zigzag wave | |||
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| zigzag wave | |||
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曲折 波 : 15 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Construction | 1 |
| Economy | 1 |
| General | 1 |
| Physics | 1 |
| Space | 3 |
| Technology | 6 |
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