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为了排除相关系数与相似系数均具有对称性的弊端，遵循气候影响有主有次的非等同性规律，本文利用灰色关联理论，着眼于不同地点之间的相互影响，划定了冬麦北移气候区。灰色关联度兼有相关和相似的内涵，同时突破相关和相似的对称性的约束。这些都真实地反映了气候关联性规律，更具有实用性。
In order to rule out the drawbacks that the correlation coefficients and the similarity coefficients have symmetry, we follow the rule of non-equivalence that there are dominant and influential climatic influences. By using the gray relational theory and focusing on the interaction between different locations, Climate zone. Gray relational degree has both related and similar connotation, at the same time it breaks through the constraints of related and similar symmetry. All of these truly reflect the laws of climate relevance and are more practical.