To be entirely harmful and without any benefit; to do more harm than good; to be utterly detrimental.
沉迷于没有实际意义的娱乐活动，往往有百害而无一利，不如把时间花在更有价值的事情上。
Indulging in entertainment activities without practical meaning often does more harm than good; it's better to spend time on more valuable things.
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