[] (; ) the number of times a customer contacts a company before placing an order, compared to the number of orders the company receives. The contact-to-order ratio is used as a measure of how efficiently a company's ordering system works. 接触订货比（顾客订货之前接触公司的次数与公司接到的订单数目的比率，用於衡量公司订货系统的效率）