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51. | weighted product |
| 加权积 |
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52. | product topology |
| 积拓扑 |
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53. | carbon deposit |
| 积碳 |
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54. | cardinal product |
| 基数积 |
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55. | symmetric product |
| 对称积 |
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56. | A vector product. |
| 矢积 |
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57. | sign of integration |
| 积分号 |
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58. | vomiting due to retention of food |
| 积吐 |
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59. | algebra product |
| 代数积 |
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60. | cartesian product |
| 笛卡儿积 |
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