But once you know the pattern then it explains what these relationships are about.
但你一旦理解了模式，他就会解释这些关系是关于什么的。
What explains the bad decisions that do undeniably get made even in these propitious circumstances?
怎么解释在这些有利条件下、无可辩驳地做出的糟糕决策呢？
A design guide section explains what the elements of the patterns actually are, and the alternatives and trade-offs associated with these elements.
设计指导部分解释了什么是模式元素，以及与这些元素相关联的替代和权衡。
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