White Dew indicates the real beginning of cool autumn. The temperature declines gradually and vapors in the air often condense into white dew on the grass and trees at night.Although the sunshine in daytime continues the heat of summer, temperatures decrease rapidly after sunset. At night, water vapor in the air turns into small drops of water when it encounters cold air. These white water drops adhere to flowers, grass and trees，and when the morning comes, the sunshine makes them look crystal clear, spotless white and adorable.