阶梯倍投法的具体操作

简介：Su Can and Cheng Keshu walked through the streets where they had lived for almost two years. The leaves of the camphor and sycamore trees had fallen off, the branches were dry, and fine snowflakes were falling from the sky. Time was so unhurried. The rest of their lives were long and there was a lot of time. , the road is still long, we can spend a lifetime to support each other.