In order to improve the accuracy of model prediction, the training samples should be representatively prepared.
为了提高模型的预测精度，在训练样本的选择上还应具有一定的代表性。
The precious tradition for having some consciousness of social participation might be taken as the epochal feature that has representatively characterized the Beijing youth as a prominent marker.
社会参与意识的优良传统，是北京青年身上具有标志性和代表性的时代特征。
The precious tradition for having some consciousness of social participation might be taken as the epochal feature that has representatively characterized the Beijing youth as a prominent marker.
社会参与意识的优良传统，是北京青年身上具有标志性和代表性的时代特征。
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