```[video] src: >- https://iblah-education.oss-cn-beijing.aliyuncs.com/%E5%85%B6%E5%AE%83%E8%A7%86%E9%A2%91%E7%B1%BB/%E5%AD%A6%E7%94%9F%E9%85%8D%E9%9F%B3%E8%A7%86%E9%A2%91%E6%95%99%E5%AD%A6_%E7%BC%96%E8%BE%91.mp4 poster: >- https://iblah-education.oss-cn-beijing.aliyuncs.com/%E5%85%B6%E5%AE%83%E8%A7%86%E9%A2%91%E7%B1%BB/%E5%AD%A6%E7%94%9F%E9%85%8D%E9%9F%B3%E8%A7%86%E9%A2%91%E5%B0%81%E9%9D%A2.png ```