https://samaelectronic.wordpress.com/2020/11/05/%d8%b1%da%a9-%d9%85%d8%ae%d8%b5%d9%88%d8%b5-dvr/
https://www.blogger.com/blog/post/edit/preview/1384382914747961743/2469681989564593185
https://samaelectronic.edublogs.org/2020/10/24/%d8%ae%d8%b1%db%8c%d8%af-%d9%88-%d9%81%d8%b1%d9%88%d8%b4-%d8%b1%da%a9-%d8%af%d9%88%d8%b1%d8%a8%db%8c%d9%86-%d9%85%d8%af%d8%a7%d8%b1%d8%a8%d8%b3%d8%aa%d9%87/