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51. | pole at infinity |
| 无穷远极 |
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52. | control cabinet |
| 控制极 |
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53. | dead mild [soft] steel |
| 极软钢 |
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54. | on cloud nine; extremely happy |
| 极快乐 |
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55. | polar coordinate system |
| 极坐标系 |
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56. | polar variation |
| 极变化 |
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57. | polar excitation |
| 极兴奋 |
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58. | Pole of Inaccessibility |
| 难接近极 |
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59. | polar moment of inertia |
| 极惯性矩 |
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60. | dipolar protophobic solvent |
| 极疏质子溶剂 |
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