They were forced to swap school for backbreaking labor in desperate conditions.

这些还在上学阶段的青少年被迫在艰苦的环境下进行非常辛苦的劳动。

One can hardly wield a hoe or work stone or do any other type of backbreaking labor with a long pinky fingernail.

小指留着很长的指甲就很难使用锄头或石具或干其他类型的重活儿。

He hadn't sold anything yet. He was still penniless and desperate, and he knew that to make something of his idea was going to require years of backbreaking labor.

当尽管他还没有开始卖出东西；他仍然身无分文而且十分沮丧；他知道如果按照自己的想法去做些事情，需要很多年辛苦工作的积累。