日本が世界貢献
<iframe width="1070" height="1903" src="https://www.youtube.com/embed/6dobTygQEe0" title="Doosan DX225 Final Drive Repair & Maintenance Step by Step" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<iframe width="1280" height="720" src="https://www.youtube.com/embed/ARd-Om2VyiE" title="油性ギアーセットに対する理解" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>