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51. | original recording |
| 原始录音 |
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52. | primitive sentence |
| 原始句 |
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53. | primitive variety |
| 原始变种 |
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54. | original section |
| 原始剖面 |
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55. | primordial potency |
| 原始能力 |
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56. | original mother plate |
| 原始母板 |
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57. | original evidence |
| 原始证据 |
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58. | original scheme |
| 原始计划 |
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59. | original fission |
| 原始裂变 |
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60. | original source |
| 原始资料 |
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