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21. | polar hyperplane |
| 极超平面 |
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22. | polar modulation |
| 极化调制 |
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23. | polar telescope |
| 北极管 |
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24. | polar pantograph |
| 极坐标缩放仪 |
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25. | polar translocation |
| 极性运输 |
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26. | polar expansion |
| 线膨胀 |
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27. | polar variation |
| 极变化 |
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28. | polar meteorologist |
| 极地气象学家 |
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29. | polar decomposition |
| 极分解 |
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30. | polar capacitor |
| 极性电容器 |
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