Sometimes, by buying something cheap now, you will be costing yourself more in the long run.
有时候你花了很少钱买了便宜货,但它日后可能要花掉更多的钱。
To get a full appreciation of what this means we must turn first to some recent human inventions.
要透彻理解这句话的意义,我们应先回顾一下人类最近的几项发明。