层进式阶梯倍投法实例简介：Yan Lingbi stood up. Although he was already over forty years old, he seemed to be still a child in front of the emperor's brother-in-law. It was common for the emperor to affectionately call him by his nickname.
Yan Lingbi stood up. Although he was already over forty years old, he seemed to be still a child in front of the emperor's brother-in-law. It was common for the emperor to affectionately call him by his nickname.
