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| campo de referencia (A field that is associated with another field so that their properties always match. If the properties in one field are changed, the properties in the other field are updated automatically) | |||
| zona de referencia | |||
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reference field : 4 短语, 3 学科 |
| 信息技术 | 2 |
| 天线和波导 | 1 |
| 收音机 | 1 |