guard cell
noun [ C ] biology specialized uk/?ɡɑ?d ?sel/ us/?ɡɑ?rd ?sel/
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。)
on a leaf, one of a pair of cells positioned around each stoma (= a small hole in the surface) that open it to release gases or close it to prevent water from being lost


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