Numerous companies sprang up employing thousands to work the oil-rich fields of Texas.许多公司如雨后春笋般涌现，雇用成千上万的工人开采得克萨斯州的大油田。One of the mysteries of our times is why some oil-rich countries have so many poor living in them.我们这个时代的谜团之一是为什么一些盛产石油的国度里生活着这么多穷人。