先用这个

//www.youtube.com/v/XZqXC5IxGTE?si=6WKQHyLqBW8PFzRn?version=3&hl=en_US" type="application/x-shockwave-flash" width="853" height="480" zsy0e0oiprawscriptaccess="always" all="" fulreen="true"/>

然后在你要贴的油管的视屏，点击，“分享”，例如“XZqXC5IxGTE?si=6WKQHyLqBW8PFzRn”  

就是从这里//www.youtube.com/v/XZqXC5IxGTE?si=6WKQHyLqBW8PFzRn?version=3&hl=en_US" type="application/x-shockwave-flash" width="853" height="480" zsy0e0oiprawscriptaccess="always" all="" fulreen="true"/>

你复制的地址置换红色字母，其他保持

到了发新帖，比如这里，点击最左边的HTML

然后把整个的//www.youtube.com/v/XZqXC5IxGTE?si=6WKQHyLqBW8PFzRn?version=3&hl=en_US" type="application/x-shockwave-flash" width="853" height="480" zsy0e0oiprawscriptaccess="always" all="" fulreen="true"/>