As a boy I had read literally hundreds of books.

当我还是个孩子的时候，我真真切切地读过几百本书。

youdao

She disguised herself as a boy.

她女扮男装。

《牛津词典》

I used to play here as a boy.

我小时候常在这里玩。

《牛津词典》

As a boy,Carl said he knew if it was time to go to school by the sound of a train.

VOA: special.2009.11.01

As a boy, he was very smart and he was very interested in science.

孩童时期,他就很聪明,并对科学有着浓厚的兴趣

耶鲁公开课 - 欧洲文明课程节选

And as France held its breath,because they wanted a boy, this miracle baby was born,l'enfant du miracle.

法国十分紧张,他们想要一个男孩儿,然后这个孩子诞生了,奇迹之子

耶鲁公开课 - 1871年后的法国课程节选

As a boy he worked summers lighting fuses in his uncle's coal mine in Indiana.

FORBES: Magazine Article

I, the incipient novelist, even as a boy, was fascinated by the way people do talk.

NEWYORKER: This Woman��s Work

As a boy, the former British PM won a poetry prize at Harrow School.

BBC: Winston Churchill poem to be auctioned