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https://kenyamazaki.com/2016/01/15/%e3%83%97%e3%83%a9%e3%82%a4%e3%83%9e%e3%83%aa%e3%83%bc%e9%a0%98%e5%9f%9f%e3%81%af%e5%b0%82%e9%96%80%e6%80%a7%e3%81%8c%e4%bd%8e%e3%81%84%e3%81%ae%ef%bc%9f/
プライマリー領域は専門性が低いの?