The avianize of altruistic behavior depends on their high cost and low income.

摘要利弱化在于利的高成本低收益。

The strength of altruism lies in the fact that altruistic acts undeniably occur in any society and that moral codes universally advocate altruism or benevolence and condemn selfishness.

毫疑问,利主义存在于任何社会,而且道德准也普遍提倡利主义或善良,而谴责自自利。这也正是利主义具有强大生命力的原因。