上周我们已经讲述过，这个概念由来已久。
We talked last week about how this idea developed a long time ago.
工作台、桌面端、软件包以及很多其他概念在企业级软件里由来已久。
The idea of workbenches, desktops, suites and many others was before in enterprise software.
有几个人曾问我有关极性概念的由来，极性概念是我去年开始研究的。
Several people have asked me about the origins of the polarity concept I began exploring last year.
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