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41. | on cloud nine; extremely happy |
| 极快乐 |
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42. | polar coordinate system |
| 极坐标系 |
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43. | polar excitation |
| 极兴奋 |
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44. | polar coordinate paper |
| 极坐标纸 |
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45. | polar moment of inertia |
| 极惯性矩 |
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46. | Pole of Inaccessibility |
| 难接近极 |
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47. | polar variation |
| 极变化 |
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48. | dipolar protophobic solvent |
| 极疏质子溶剂 |
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49. | pole at infinity |
| 无穷远极 |
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50. | polar decomposition |
| 极分解 |
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