____，青山郭外斜。《过故人庄》陶渊明
下图是郭沫若故居里的一副对联，请用楷体字规范、美观地抄写在田字格内。
上联：
下联：事非经过不知难
— Did you see the teacher come into the classroom?
一 No, I didn't I at that time.
