| 释义 |
guard cell
noun countable specialized
■on a leaf, one of a pair of cells positioned around each stoma (= small hole in the surface) which open it to release gases or close it to prevent water from being lost 植物的保卫细胞（保卫细胞组成环状，构成了叶子的气孔，能控制气流的进出，阻止水分流失） |