Mary was a very difficult child.

玛丽过去是一个很难弄的孩子。

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He is a difficult child.

他是个顽固的小孩。

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He has always been a difficult child.

他一直是个闹人的孩子。

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Many of his stories are about a child trying to survive while facing difficult emotions such as fear.

VOA: special.2009.10.05

The relationship between Moses and God is a very intimate one, very much like a husband and wife, who are working together a s partners and parenting a difficult child.

上帝和摩西的关系是非常亲近的，就像丈夫和妻子,一起合作照看一个很难满足的小孩。

耶鲁公开课 - 旧约导论课程节选

Now, that's actually a difficult question to ask-- to answer for a child, but I tried my best to give him an answer.

向一个孩子解释这个问题其实挺困难的，但我还是尽力给了他一个答案。

耶鲁公开课 - 心理学导论课程节选

Isabel says she remembers a difficult child who wouldn't open up.

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"She is a difficult child, " said Ms Walker.

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However, the degree of aggression and dissocial acts means it is more serious than just a difficult parent-child relationship.

BBC: Mental health: Conduct disorders