谆 諄 zhun1
repeatedly (in giving advice); sincere; earnest; untiring

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言
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谆谆 諄諄 zhun1 zhun1
earnest; devoted; tireless; sincere; assiduous

谆谆告诫 諄諄告誡 zhun1 zhun1 gao4 jie4
to repeatedly advise sb earnestly (idiom); to admonish