艰苦的磨练 meaning in English

school of hard knocks

I expect it to be quite an ordeal .
可以预料，那将是非常艰苦的磨练。
He never went to high school . he was educated in the school of hard knocks
连高中都没上过。他是受了艰苦的磨练而成长起来的。
A ： he never went to high school . he was educated in the school of hard knocks
连高中都没上过。他是受了艰苦的磨练而成长起来的。
During 15 - year tough tempering in the market challenges and competitions , we accumulate lots of production experiences to satisfy various demands of our customers on manufacturing ( processing ) all kinds of plastic moulds . ? there are more than 20 special engineering technicians to ensure the powerful capabilities on designing and mould - making , as well as the advanced importing equipment e . g . 4cnc processing centers , 15 spark machine and several infection machines tor mould - making
本厂成立十五年来，经过艰苦的磨练和市场竞争的挑战，使本厂积累了丰富生产经验；本厂拥有专业工程设计人员20多人和一批经验丰富的专业技术人员，因而具有强大的设计和制模能力；本厂引进了国外的先进设备，拥有进口cnc加工中心四台、火花机十五台以及多台注塑料模具，能够满足新老客户的需求。