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51. | primary sector (industry) |
| 初级部门 |
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52. | preliminary inquiry |
| 初级侦讯 |
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53. | primary electron |
| 初级电子 |
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54. | primary type glider |
| 初级滑翔机 |
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55. | primary oscillator |
| 初级振荡器 |
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56. | primary productoin |
| 初级生产 |
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57. | primary polyploid |
| 初级多倍体 |
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58. | primary tentacle |
| 初级触手 |
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59. | primary producer |
| 初级生产者 |
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60. | primary voltage |
| 初级电压 |
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