之后人类选择具有独特基因的动物或植物个体进行配对，使它们那些为人所需的特性变得更为普遍和显著。
Humans then chose to mate individual animals or plants that carried the particular gene in order to make the desired characteristics more common or more pronounced.
在条件反射阶段，呈现条件刺激物（CS）与无条件刺激物（UCS）的配对，使被试形成对条件刺激物的态度；
In the conditioning stage, experimenter present the pairing of conditioned stimulus (CS) and unconditioned stimulus (UCS) to the participants so that they could form attitude towards CS.
在条件反射阶段，呈现条件刺激物（CS）与无条件刺激物（UCS）的配对，使被试形成对条件刺激物的态度；
In the conditioning stage, experimenter present the pairing of conditioned stimulus (CS) and unconditioned stimulus (UCS) to the participants so that they could form attitude towards CS.
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