diff --git a/TangDou/Geogebra/听课笔记.md b/TangDou/Geogebra/听课笔记.md
index e2892b1..6775e77 100644
--- a/TangDou/Geogebra/听课笔记.md
+++ b/TangDou/Geogebra/听课笔记.md
@@ -18,5 +18,4 @@
 #### 1.1 用工具和属性绘制简单图形
 ![](https://dsideal.obs.cn-north-1.myhuaweicloud.com/HuangHai/BlogImages/202401311531627.png)
 
-
-$CTRL+F$可以擦除轨迹
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+**[$GeoGebra$如何擦除踪迹——移动视图、放大、设置活动视图](https://zhuanlan.zhihu.com/p/298051355)**
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