わかる？
https://www.tokyomotion.net/video/5085375/%E5%80%8B%E4%BA%BA%E6%92%AE%E5%BD%B1-%E7%BE%8E%E5%91%B3%E3%81%97%E3%81%9D%E3%81%86%E3%81%AB%E3%83%81%E3%83%B3%E3%82%B3%E3%82%92%E5%92%A5%E3%81%88%E3%82%8B%E5%BD%BC%E5%A5%B3#