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    What does it mean when a person suddenly changes? It mean
    0:19

    What does it mean when a person suddenly changes? It mean

    Failure does not mean that you are poor, but reminds you
    0:16

    Failure does not mean that you are poor, but reminds you

    Don't give up on yourself and accept the challenge of lif
    0:07

    Don't give up on yourself and accept the challenge of lif

    Human energy=the square of thought action speed
    0:10

    Human energy=the square of thought action speed