If you drop water on a fresh lotus leaf, you will find that the water droplets will roll around on it like beads without seeping out. This is because there is a dense layer of "puff" on the surface of the lotus leaf that is invisible to the naked eye. These "puffs" are actually the waxy papillae structure of the lotus leaf, and there are many particles attached to the surface of the papillae. This structure makes water droplets Not easy to spread. Therefore, there is no oil on the surface of the lotus leaf.