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51. | combinatorial mathematics |
| 组合数学 |
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52. | segment mold |
| 组合模 |
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53. | collective packing |
| 组合包装 |
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54. | combination probe |
| 组合探针 |
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55. | stock portfolio |
| 股票投资组合 |
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56. | transfer and unit machine |
| 组合机床 |
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57. | policy mix |
| 政策组合 |
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58. | combination of pulley |
| 滑车组合 |
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59. | aerial assembly |
| 天线组合 |
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60. | combination tail lamp |
| 组合尾灯 |
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