My mother asked an expert to calculate the optimal delivery time for my sister and me to give birth to the fetus in our belly, saying that if the child was cut out at this time, the child would definitely be a child prodigy. I decisively refused. A premature child cannot even be healthy, so what's the use of being smart? Seeing how decisive I was, my sister resisted her inner impulse and refused. Later, we gave birth to the baby at full term, but my sister thought that the baby was not smart enough and too mediocre. "My child was supposed to be a child prodigy, but now he is so mediocre. It's all because you didn't want to give birth to me in advance and I missed the opportunity!" As the child grew up, my sister worked hard to tutor the child, and finally came to my house in a state of collapse, and died together with me in a fire. When I opened my eyes again, I went back to the day when my mother asked an expert to calculate the delivery date for us. The sister beside me looked at my mother with bright eyes.