| 单词 | guard cell |
| 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） |
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