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。

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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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