紫薯比普通的番薯營養高嗎？

zishudeyingyangjiazhitebiegao。zishuyoujiaoheishu
，rouchengzisehuoshenzise。tachulejuyouputongfanshudeyingyangchengfenwai
，haifuhanxiyuansuhehuaqingsu。jinnianlai

，zishuzaiguoneiwaishichangshangshifenzouqiao，fazhanqianjingfeichangguangkuo。