일본의 인류 공헌
<iframe width="1100" height="619" src="https://www.youtube.com/embed/9qu_Vr6Zqnw" title="Forging a Steel Cable Knife : Watch the Entire Process!" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>