The food which the roots draw from the soil, and the food which the leaves draw from the air, are changed by the action of light, and are made into starch and other substances which build up the plant.

根从土壤中汲取食物、叶子从空气中吸收养分, 而它们正是通过阳光的作用才能够转化为构成植物本身的淀粉与其他物质。