即使您查询的是美国国内邮件，也必须输入国码。
The country code is required even if you are tracking a US domestic shipment.
为了有效地加工、分析和处理XML数据，国内外学者已经提出了各种XML的查询语言和存储管理技术。
In order to effectively analyze and process these XML data, researchers have proposed various query languages and storage managing techniques of XML.
目前在国内的很多的大型城市已经相继的研制开发了城市电子地图系统，城市之窗，公众信息查询系统等。
Now, in our country, many large cities have developed city electric map system, for instance, Cities Windows, Common Information Query System, etc.
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