diff --git a/docs/机器人Manipulation/mechanics of manipulation.md b/docs/机器人Manipulation/mechanics of manipulation.md
index 1d390a44..3b5641f9 100644
--- a/docs/机器人Manipulation/mechanics of manipulation.md	
+++ b/docs/机器人Manipulation/mechanics of manipulation.md	
@@ -13,10 +13,10 @@
 ## 课程资源
 
 - 课程网站：<https://modernrobotics.northwestern.edu/nu-gm-book-resource/>
-- 课程视频：<https://www.bilibili.com/video/BV1GJ411k7fE/?spm_id_from=333.337.search-card.all.click&vd_source=eef9fdd8258abe1852dc2fb46957f1d0>
+- 课程视频：<https://modernrobotics.northwestern.edu/nu-gm-book-resource/foundations-of-robot-motion/>
 - 课程教材：<http://hades.mech.northwestern.edu/index.php/Modern_Robotics>
 - 课程作业：<https://github.com/NxRLab/ModernRobotics/tree/master>，这个只是配套的软件，并没有公开的很好的作业资源. 或许可以参考这门课程的作业 <http://www.cs.cmu.edu/~cga/kdc-11/>
 
 ## 资源汇总
 
-@PKUFlyingPig 在学习这门课中用到的所有资源和作业实现都汇总在 [PKUFlyingPig/cs50_ai - GitHub](https://github.com/PKUFlyingPig/cs50_ai) 中。
+这门课的讨论论坛在 <https://piazza.com/cmu/fall2023/rob101>