Technology has advanced , the requirement for backbreaking toil has diminished .
随着技术的进步，繁重的体力劳动需要减少了。
And no one should want to sugar coat the tougher side of life here either , including long shifts at backbreaking jobs for low pay that is familiar to american workers .
When the persuading and the planning for the western railroads had been completed , the task remained : the dangerous , sweaty , backbreaking , brawling business of actually building the lines .
