As friends are both helpful and disastrous, it is better to keep company with the true friends who are helpful, encouraging and loyal, but to avoid those who are mean, stingy and treacherous.
由于既有有助于我们的朋友，也有有害于我们的朋友，因此我们最好和那些对我们有所帮助、有所鼓励和忠实的真正朋友交往，而要避免和那些庸的、吝啬的、奸诈的人交往。
German scientists have found what they call a "mean gene" that makes people stingy with their money, Britain's Daily Mail reported.
英国《每日邮报》报道，德国科学家发现了一种“小气”基因，这种基因让人在花钱方面很小气。
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