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| مجموعة مرجعية (A group that is associated with another group so that their properties and the properties of the groups and fields they contain always match. If the properties of one group are changed, the other group is updated automatically) | |||
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reference group : 5 短语, 3 学科 |
| 电力线路 | 1 |
| 组织机构名称 | 2 |
| 联合国 | 2 |