In one year she turned from a problem child into a model student.

一年内，她从问题儿童变成了模范学生。

《牛津词典》

Thanks to my English teacher, I turned from a problem child into a model student in just one year.

多亏了我的英语老师，我在一年内从问题儿童变成了模范学生。

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He used to be a "problem child".

他曾经是一个问题小孩。

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He says child labor is an especially serious problem in West African countries.

VOA: special.2009.06.08

And the problem for Freud is premature weaning of a child.

在弗洛伊德看来,问题就出在孩子过早断奶上面。

耶鲁公开课 - 心理学导论课程节选

Each child had no other health problem.

VOA: special.2009.01.13

Sheen has a long history as a problem child and I am not defending either his self-destructive or violent behavior.

FORBES: Charlie Sheen And Public Company Disclosure

While not a PIIGS member, or even a member of the Eurozone for that matter, Hungary has been a European problem child for most of 2010.

FORBES: ETFs For Hungary's Ratings Downgrade

But as the problem child acquired by Daimler-Benz in 1998 has started to make its own way in the world, its parent has run into difficulties.

ECONOMIST: Dazzled by the rising sun | The