「心機一転」の意味と例文 https://noteolsen.com/2023/01/15/%e3%80%8c%e5%bf%83%e6%a9%9f%e4%b8%80%e8%bb%a2%e3%80%8d%e3%81%ae%e6%84%8f%e5%91%b3%e3%81%a8%e4%be%8b%e6%96%87/