Update D3_of_3Day_DoneWithPython.md

Author: MurphyWan

D3_of_3Day_DoneWithPython.md

@@ -654,7 +654,7 @@ print(’Normal test p-value is %f’ \
 ![](http://upload-images.jianshu.io/upload_images/5522220-cd6a23ee687856ca.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
 
 
-[回到第一天(back to D)](https://github.com/MurphyWan/Python-first-Practice/blob/master/D1_of_3Day_DoneWithPython.md)
+[回到第一天(return to D1)](https://github.com/MurphyWan/Python-first-Practice/blob/master/D1_of_3Day_DoneWithPython.md)
 
 
-[回到第二天(back to D2)](https://github.com/MurphyWan/Python-first-Practice/blob/master/D2_of_3Day_DoneWithPython.md)
+[回到第二天(return to D2)](https://github.com/MurphyWan/Python-first-Practice/blob/master/D2_of_3Day_DoneWithPython.md)