All plants need air, but houseplants dont get much fresh airwhen it is cold outdoors.
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They would need a way to renew all their resources; this could be explained by growing plants for food and air.
他们必须得有自我更新资源的方法；这些可以用种植植物来生产食物和氧气以解释。
All living things need food to survive, but not all living things eat the same kinds of food. Plants make their own food from sunlight, air, and water.
所有的生物都需要食物来维持生存，但并不是所有的生物吃相同种类的食物，植物制造阳光、空气、食物和水。
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