undeniably

1.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,利他主存在于任何社会,而且道德准也普遍提倡利他主或为,而谴责自私自利。这也正是利他主具有强大生命力的原因。