单双循环问题公式

简介：After repelling the thieves, Yan Yingyuan became famous and was regarded as a hero by the county people. However, his mother's illness made him depressed. He also vaguely realized that his mother's illness might be related to the soil and water. He wanted to resign, but his boss refused. When he was distressed, the crown prince's important order arrived, and the messenger brought the order's doctor with him.