root sum的用法和樣例：
例句
- Perennial Old World herb having rayed flower heads with blue florets cultivated for its root and its heads of crisp edible leaves used in salads.
舊大陸的多年生植物，開(kāi)藍花，通常為取其根和葉而栽培，其葉可做沙拉菜。 - Root used as medicine for Banlangen leaves used as medicine for the Daqingye, roots and leaves are heat-clearing and detoxifying and Cooling effect.
根入藥為板藍根，葉入藥為大青葉，根和葉都有清熱解毒，涼血作用。
