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.
知之愈深，信之愈笃，行之愈实。
，这一点在heLLoword翻译官方下载中也有详细论述
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so he was a welcoming voice on Python.