{"rich_content":{"text":"战斗机的马赫环是如何形成的？环数代表战斗机性能的强弱吗？","spans":null},"video":{"vid":"v0d8b07d0000c0c7khfvjmo8huqcjmtg","duration":233.5,"width":1024,"height":576,"file_size":13830534,"thumb":{"web_uri":"tos-cn-p-0000/1b9ead99792d4f95ae93e3702ce912dc","width":640,"height":360,"image_type":null,"mimetype":null,"encrypt_web_uri":null,"secret_key":null,"encrypt_algorithm":null,"extra":null},"video_size":{"high":{"duration":233.5,"file_size":13119570,"w":854,"h":480},"normal":{"duration":233.5,"file_size":9787318,"w":640,"h":360},"ultra":{"duration":233.5,"file_size":15745093,"w":1024,"h":576}},"is_encrypted":null,"sp":null,"md5":"9c81ff7112cd9805e3c72b97b8c78278","tos_key":null,"secret_key":null,"encrypt_algorithm":null,"extra":null}}