近代医学发展的影响因素:工业革命 The starting point-textile industry Superintendent and spinner in North Carolina textile mill, 1909 One-quarter of the employees in this mill were this girl's age or younger 以户P声Pbyv↓y 珍妮纺纱机 Spinner Jenny近代医学发展的影响因素：工业革命 珍妮纺纱机 Spinner Jenny The starting point-textile industry