日本人たちが礼儀正しい本当に理由
<iframe width="560" height="315" src="https://www.youtube.com/embed/wXvP-pIM7mc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>