any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae
submerged freshwater perennials
同义词：Elodea, genus Elodea, ditchmoss
pondweed详细解释
pond.weed n.（名词）Any of various submerged or floating aquatic plants of the genusPotamogeton having inconspicuous flowers borne in small spikes. 水池草：一种在水中或浮在水面的眼子菜 属水生植物，有生成小穗的不显眼花朵
