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

摘要利他行弱化在于利他行的低收益。

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.

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