He can never be a child. He needs to learn to be independent.

译文：他不能永远是个孩子，他应该学会自立。

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Sometimes a young child may get over-excited and be a little too rough, but it's never a serious matter.

有时一个小孩子可能会过于兴奋和有点过于粗暴，但这从来都不是一个严重的问题。

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Problems such as how a child learns language or how a fertilized egg becomes an organism are horrendous in practice and may never be solved completely.’ [emphasis added].[18]

像诸如一个孩子如何学习语言或一个受精卵如何变成生物体这样在实际中难缠的问题也许永远也不可能完全解决。

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Flying a small aircraft may never be child's play, but it is coming closer and closer to resembling a video game.

ECONOMIST: MONITOR

Paul said that although you never get over the loss of a child, he and Heather are trying to be strong.

BBC: NEWS | Health | 'We wanted our child's post-mortem'

There is plenty of evidence that "second-hand" smoke - breathed when you are in the same room as someone smoking - can be harmful, particularly to children, and some parents adopt a strategy of never smoking in their child's presence.

BBC: Warning over 'third-hand smoke'