ssion with land and farming is the same. For thousands of years, no one has ever tried to get them to grow sweet potatoes, they don't even recognize this thing, and it's not easy to get them to change... this matter has anything to do with Zhao Xuanji"Xu Changqing pondered for a while, then said: "Your servant thinks it doesn't matter much."Li Chen's face was emotionless as he said, "Speak."This is g...