A child first labels the household pet cat as a "cat" and then generalizes this label to other animals that look like it.

孩子先把家养的宠物猫称为“猫”，然后把这个称呼扩大到其他看起来像猫的动物。

《柯林斯英汉双解大词典》

It is often a lingua franca of conferences, for example, and many journal articles in fields as diverse as astronomy, child psychology and zoology have English as a kind of default language.

例如，英语经常是各种会议的通用语，天文学、儿童心理学和动物学等领域的许多期刊文章都将英语作为一种默认语言。

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She loved singing as a child and started vocal training at 12.

她还是个小孩的时候就爱唱歌，12岁就开始了声乐训练。

《柯林斯英汉双解大词典》

is about his experiences as a child soldier in Sudan, how he changed and how he wants to make a difference.

VOA: special.2009.10.14

And as they were past they see that a small child has fallen into the pond and is in danger drowning.

这时，你看到,一个小孩掉进了池塘,就要溺水，情况危急。

普林斯顿公开课 - 人性课程节选

It's not the same as it was when I was growing up and it was almost, for a child, it felt scary.

它现在的模样和我小时候的不一样了。那时候，对于一个孩子来说，这个地方很可怕。

过去的时代广场 - SpeakingMax英语口语达人

And I was aware of it, and as a child I was puzzled by it.

WSJ: The Weekend Interview with Julian Fellowes: The Anti-Snobbery of 'Downton Abbey'

His father was a Communist, and as a child, before the fall of the Iron Curtain, he listened to Radio Moscow.

CNN: French star Depardieu ditches France for Putin's Russia

Mr Berezhkov was trained as an engineer but had an ear for languages and as a child had picked up English and German from his parents.

ECONOMIST: Valentin Berezhkov