Water surges from the cells on the inside of the leaf to those on the outside, causing the leaf to rapidly flip in shape from convex to concave, like a soft contact lens.
水从叶子内部的细胞涌向外面的细胞，导致叶子迅速地从凸向凹翻转，就像一片柔软的隐形眼镜。
2
The evaporation from the leaf surface causes a constant compensatory suction of water.
叶片表面的蒸发作用产生了持续的代偿吸水性。
3
The same structure that permits the one gas to enter the leaf, however, permits another gas—water vapor—to be lost from it.