【Kaiser3344提供英语地道翻译】
玉不琢不成器 人不学不知道
【翻译】If jade is not polished, it cannot become a thing of use. If a man does not learn, he cannot know his duty towards his neighbor.
【解析】
If jade is not polished, it cannot become a thing of use.
美玉如果不（经过）雕刻打磨,就不可能变成（精美的）玉器.
If a man does not learn, he cannot know his duty towards his neighbor.
（少年）人如果不（努力）读书学习,就不会懂得（为人民服务及济世救国的）道理.
【楼主】完全按照您的要求来的,若觉得满意,望多多支持哈!