C1701 The past Is like Smoke

"... Oh, I remember now." Zhou Yansoong slapped his forehead, as if he couldn't do anything to her. "By the way, I remember now. You were only ten years old at that time. I saw that you were reading a chemistry book, so I taught you a little. Then, your practice spirit was very good, so you went to try another day. Then, the laboratory exploded