水洒在桌子上,要用抹布擦干。五六岁的孩子爱帮妈妈干活,颠颠儿地拿来抹布,可总是擦不净。妈妈也拿来一块抹布,几下就把水擦没了。孩子很奇怪。妈妈告诉他,你用的是干抹布,我用的是湿抹布。这个生活小场景包含好几个科学原理。先说说荷叶,荷叶的表面结构很奇特,其一是粗糙,其二是充满了空气,空气阻止了水向内部渗透, Water spilled on the table, use a rag to dry. Five or six-year-old children love to help mothers work, top Britain children to bring rags, can always rubbed. Mom also brought a rag, wipe the water a few times. Children are weird Mom told him that you use a dry rag, I use a wet rag. This life scene contains several scientific principles. First talk about lotus leaf, lotus leaf surface structure is very strange, one is rough, and the other is full of air, air to prevent the water to the internal penetration,