carbohydrate gum英 [ˌkɑːbəʊˈhaɪdreɪt ɡʌm]美 [ˌkɑːrboʊˈhaɪdreɪt ɡʌm]网络 糖胶机械双语例句Investigation of the structure of carbohydrate unit of gigantic molecule of sesbania gum田菁胶分子中糖单元的结构研究