从概念上讲，电子商务与众所周知的商业服务并无不同，后者的服务包括像电话银行、“邮购”目录，或通过传真向供应商发送采购订单等。

Conceptually, e-commerce does not differ from well-known commercial offerings such as banking by phone, "mail order" catalogs, or sending a purchase order to supplier via fax.

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如果更改采购订单，可能会影响数以百计的订单项和供应商的相关采购订单。

A change to a purchase order could affect hundreds of order items and associated purchase orders for vendors.

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例如如果您是负责采购订单的您或许已经化了好几个月、或者好几年，才挑选出最好的供应商。

For example, if you're in charge of ordering supplies, it might have taken you months, or years, to figure out which vendors give the best deals.

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