植物在自然界的模式。这些叶片是来自巨大的半边莲属植物。生长在乞立马扎罗山脉，坦桑尼亚国，螺旋形叶片围绕中心。
The leaves of a giant lobelia plant, photographed on Mount Kilimanjaros Shira Plateau in Tanzania, spiral around the center. Photograph by George F. Mobley.
安装后的叶片绕纵向中心轴呈自上而下均匀设置的螺旋形。
The blades after being installed take spiral shapes which are evenly arranged from the top to the bottom around the longitudinal central shaft.
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