Listen to my mother that slippery due to dust and dirt on top to hold water, even if some dust, immediately drizzle the next point will be clean as new.

• 听妈妈说滑溜溜的原因是让灰尘和污垢在上面站不住脚，即使有些浮尘，下点小雨马上就会清洁如新的。