Historically, doing lots of backbreaking work is how countries have become rich. And being rich is how some people get the chance to do more pleasant work.
对大部分时间里的大部分人来说，工作大多是不令人愉快的。历史上，辛苦勤劳地工作是国家致富的源泉。而变富是一些人有机会做比较令人愉快的工作的原因。