Tā xiǎoshíhou tānwán, zhǎngdà hòu cái hòuhuǐ méiyou hǎohǎo dúshū.
He played his way through childhood and only regretted not studying properly once he grew up.
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usage
贪 "greedy for" before an activity names a weakness for it: 贪玩, 贪吃 (greedy for food), 贪睡 (fond of sleeping in). Said of a child, 贪玩 is a mild, almost fond complaint; said of an adult it means neglecting work for fun.