Once up on a time they were bad children.

很久以前他们是一群坏孩子。

youdao

There are no bad children. You can't change a bad child, but you can change bad behavior.

世界上没有坏孩子。你不能改变一个坏孩子，但你可以改变坏习惯。

youdao

Many working parents rely on relatives or nannies to take care of their children, which may have bad impact on parents-child relationship.

许多职业父母都依靠亲戚或者保姆来帮忙照看孩子，这有可能对亲子关系带来不利影响。

youdao

People did not object to making young children work long hours, in places that had bad air and bad light.

VOA: special.2010.08.01

"You do not know how bad that is going to be. There have been children who have died from the swine flu,".

VOA: standard.2009.12.18

It said research also suggests grouping by ability had a bad effect on children in the lowest groups.

BBC: Summer-born hit by school streaming

He said the degree of uncertainty was bad for the children and families, while the delays with the courts was "extremely worrying".

BBC: Court delays 'damaging' children in care

Parents are understandably reluctant to have their children medicated for bad behavior, but when all else fails, treating children to stabilize their uncontrollable aggressive acts and to make them more amenable to psychological interventions is an attractive option.

WSJ: Neurocriminology: Inside the Criminal Mind