食物从何处来?动物(包括人)的食物“最终”从植物中来,植物的食物从大气和土壤中来。然而从大气中吸取的二氧化碳和从土壤中吸取的水分,它们本身又都不是食物,它们只有“在阳光下”,在叶绿体中,反应“变成”食物。植物如果吸入二氧化碳的量和水分的量不足,就会挨饿甚至饿死。这 Where does the food come from? The food of the animal (including human) comes from the plant “finally”. The food from the plant comes from the atmosphere and soil. However, the carbon dioxide absorbed from the atmosphere and the water extracted from the soil are not themselves food. They only “under the sun” and in the chloroplast, the reaction “turns into” food. If the amount of carbon dioxide inhaled and the amount of water is insufficient, plants will starve or even starve. This