purchase by order

基本解释

A purchase made by signed order, as for a periodical for a specified period of time or for a series of performances.
通过签订购单来买东西，如在某一段时期订阅一期刊，或者订购一系列演出之戏票。
odict.net
At the same time, we request you to give us your purchase order by three working days from 20th of the previous month for our shipping preparation.
同时，为了出货准备，从上一个月的20号前后三天开始。我们要求你们给我们提供你们的订购单。
The books-seller can secure the sensitive information in the purchase order by employing any of the following three XML encryption methods of the XmlEncryption class
通过使用 XmlEncryption 类的以下三种 XML 加密方法中的任何一种，图书销售商就可以保护采购订单中的敏感信息

People spend hours analyzing their next purchase by comparing quality and prices in order to get the very best deal possible.
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