sap  noun

[sæp] 

a watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant

(植物体内运送养分的)液，汁

例句：

The leaves, bark and sap are also common ingredients of local herbal remedies.

树叶、树皮和树汁也是当地草药的常用药材。