\(\biggl| r \cdot b - a \biggr| = \biggl| \frac{p}{q} \cdot b - a \biggr| = \biggl| \frac{b \cdot p - a \cdot q}{q} \biggr| \)
Infrastructure-Modules are not layers. An infra-module should be used only by its Business-Module. If there’s code you would like to share among many modules, move it to a stand-alone module or a library.
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过去一年如此，过去五年又何尝不是？习近平总书记看得深远，“什么时候没有困难？一个一个过，年年过、年年好，中华民族5000多年来都是这样。”