求翻译：通常使用3种方法来控制客户订货模式。第一种看库存情况来决定采购产品数量. 第二种是根据上季度的销售量来采购。第三种方式是使用电话销售人员。企业的代表每个月在规定的一次或多次的时间里与客户通过电话联系，获取订单。是什么意思？

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Usually used three methods to control model customers' orders. The first view is a decision to purchase stocks for a number of products is based on 2 quarter sales for the procurement. A third way is to use telephone sales staff. The representative of the company every month once or several times at

3 methods are typically used to control customer ordering patterns. First look at inventories to decision purchasing the product quantity. The second is based on last quarter's sales to purchase. A third way is to use the telephone sales personnel. Representatives of enterprises in the stipulated ti