It used to be usual to bind out promising boys for many years.

过去,人们经常让有出息的男孩子拜师学艺好多年.

《简明英汉词典》

In 1937 he was compelled to bind out his twelve - year - old son to a blacksmith.

一九三七年他不得不订合同让他十二 岁 的儿子给铁匠当学徒.

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