这种关系在一系列依次建造的步骤中呈现，必须分开单独理解（如下图所示）。
That nexus unfolds in a series of steps that build on one another and must be separately understood (see diagram, below).
首先对比一下建造房屋和构建数据库涉及的步骤。
Look at some of the steps involved with building a house and compare that with building a database.
您可以通过下述步骤建造一个规则。
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