As companies struggle to increase customer value by improving performance, many companies are turning their attention to purchasing and supply management. Consider, for example, CSX, the company featured at the beginning of this chapter. Almost 45 percent of the total sales of CSX is expended with suppliers for the purchase of materials and services. It does not take a financial genius to realize the impact that suppliers can have on a firm’s total cost. Furthermore, many features that make their way into final products originate with suppliers.

many features在句中表示什么意思？that引导的从句的主语又是什么？