In fact, 4-canonical map on X fails to bebirational whenever X is canonically fibred by surfaces with invariants(K~2, p_g)=(1, 2).
事实上，当X被带有不变量(K~2，P_g)=(1，2)的曲面典范纤维化时，X上的4-典范映射不是双有理的。
参考来源 - 一般型三维代数簇上的4·2,447,543篇论文数据，部分数据来源于NoteExpress
The example here goes with the canonical MapReduce application, but you'll see other applications later (along with how you would implement them in map and reduce form).
虽然此处的示例伴随着规范的MapReduce应用程序，但是稍后您将看到其他的应用程序(取决于您将如何用map和reduce格式实现它们)。
For example, it can map between a logical and physical model, that is, between the concepts of the canonical data model and the realization of these concepts in the data platform.
例如，它可以在逻辑模型与物理模型之间映射，也就是规范化数据模型的概念与这些概念在数据平台中的实现之间的映射。
Create a business object map to transform a SSA Global business object to a canonical business object.
创建一个将SSA Global业务对象转换为规范业务对象的业务对象映射。
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