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.

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。

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This XSD document defines a purchase order.

这个 XSD 文档定义了一个购订单。

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Imagine that you have a purchase order application.

假设您有一个采购订单应用程序。

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With the new Web-based software, creating a purchase order should take just a few minutes.

FORBES: Magazine Article

In four out of five cases the mobile units send a purchase order directly to the manufacturer.

FORBES: Profit in a big orange box

Go into every interview hoping you come home with a purchase order, a conditional purchase letter, or letter of interest from the decision-maker.

FORBES: Are You Making Something Usable? Part 6 -- How to do it.