er head deeply, not daring to look at Li Chen's expression. She said, "I am a merchant's daughter, the lowest of the common people, and I am unworthy of your noble status. Please forgive me... If you...sweet potato, which can be used as a staple food.Another is that its yield is ten to twenty times that of ordinary grain.What is the conceptIf true, it could alleviate the problem of food shortages th...