Propolis is a resinous substance, which bees collect from flowers and floral buttons, buds, barks of trees, especially from elms, and is used as a type of cement in the construction of the beehive.

• 蜂胶是一种树脂物，由蜜蜂从花朵、花蕊，叶芽，树皮，尤其是榆树皮中采集而得，并作为蜂窝的建筑材料之一。