Lunan says him child always cuts his finger by accident. He said this made him unhappy, so he is always worried about his child, he doesn't wish to bring him to hospital such frequently. He asked whether there is any solution.
I remember that nowadays someone has invented safety cutters, so I suggested him letting his child use safety cutters, other than normal knives, so he won't cut himself anymore, and he doesn't need to worry about him any longer.
Safety cutter is no doubt a good invention for these guys.