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| 四极系，场，子，器，透镜 | |||
| 四极透镜; 四倍 | |||
| 四极; 四极子 | |||
| 四极场 (理想的噪声源); 四极的 | |||
| quadrupole: 110 phrases in 15 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Chemistry | 5 |
| Earth sciences | 10 |
| Electronics | 19 |
| General | 1 |
| Geology | 1 |
| Geophysics | 2 |
| Information technology | 1 |
| Metallurgy | 3 |
| Physics | 2 |
| Polymers | 1 |
| Space | 4 |
| Superconductivity | 1 |
| Technology | 56 |
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