有些儿童乐此不疲，废寝忘食，不但耽误学习，且危害健康。

Some children happy, sleep or not only delay, learning, and a health hazard.

youdao

有些儿童乐此不疲，废寝忘食，不但耽误学习，且危害健康。

Some children happy, sleep or not only delay, learning, and a health hazard.

youdao