Outsiders should not interfere in the private affairs of close relatives or friends.
他深知远不间亲的道理，所以即使看到了朋友家的一些矛盾，也从未多嘴干预。
He deeply understood the principle that outsiders should not interfere in the affairs of close relatives, so even when he saw some conflicts within his friend's family, he never spoke up or intervened.
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