Close mapping of the relationship dates back to 1990, and has been strengthened by detailed modelling since 2006.

对于这种关系的精密制图可以追溯到1990年，自2006年开始，气象学家制出了这种关系的精密模型。

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The only other mapping in the Order class is a simple property mapping for the Date property. We will not spend time on that here, so you can close the Order mapping file.

Order类中现在只剩一一个简单类型，Date，我们不会再花费时间，现在你可以关闭Order类的映射文件。

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In this example, there is close mapping between the business service and the IT service, but that is not always the case.

在此示例中，业务服务和IT服务之间存在非常紧密的映射，但并非总是如此。

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