A Knife from the Song Dynasty

I often hear about time travel, but once I traveled through time, there was actually a stranger from the same country who traveled with me? Zhang Sijiu, who was still a little confused, calmed down. After being guided by fellow villagers on how to cheat, she also got to know her new identity. Well, only eight years old? What? Shocked by the bad news, mother's life hangs by a thread after childbirth? After finally rescuing one, Zhang Sijiu took the initiative to shoulder the responsibility of supporting the family. What should I do if my newborn has no milk to eat? Doctor Zhang rolled up his sleeves: I'll do it! What should you do if your family is struggling to make a living? Doctor Zhang rolled up his sleeves. What should I do if the medical environment in Da Song Dynasty is poor? Dr. Zhang rolled up his sleeves again. Zhang Sijiu is full of confidence: As long as I memorize medical books quickly enough, he will not be able to catch up with me in any difficulty. As for fellow countryman Zhang Sijiu asked politely: Are you willing to dedicate yourself to medicine?