Plants are very important for life on Earth.
植物对地球上的生命非常重要。
They can make their own food using sunlight, water, and air.
它们可以利用阳光、水和空气制造自己的食物。
This process is called "photosynthesis."
这个过程叫做“光合作用”。
Plants take in water through their roots.
植物通过根部吸收水分。
They take in carbon dioxide from the air through tiny holes in their leaves.
它们通过叶子上的小孔吸收空气中的二氧化碳。
The leaves use sunlight to turn water and carbon dioxide into food.
叶子利用阳光，把水和二氧化碳转化成养分。
This food helps the plant grow strong and healthy.
这些养分帮助植物生长，使它们健康茁壮。
At the same time, plants release oxygen into the air.
与此同时，植物释放出氧气进入空气中。
Oxygen is the gas that people and animals need to breathe.
氧气是人类和动物呼吸所需要的气体。
That is why plants help keep the air fresh and clean.
这就是为什么植物能让空气更加清新。
Without photosynthesis, plants would not grow.
如果没有光合作用，植物就无法生长。
Without plants, people and animals would not have enough oxygen.
如果没有植物，人类和动物就没有足够的氧气。
Photosynthesis happens during the day when there is sunlight.
光合作用发生在白天有阳光的时候。
At night, plants stop photosynthesis because there is no sunlight.
到了晚上，由于没有阳光，植物停止光合作用。
Forests are called the "lungs of the Earth" because they produce so much oxygen.
森林被称为“地球之肺”，因为它们制造大量氧气。
Underwater plants also do photosynthesis and give oxygen to fish.
水中的植物也会进行光合作用，为鱼类提供氧气。
Leaves are green because they have something called chlorophyll.
叶子是绿色的，因为它们含有一种叫做叶绿素的物质。
Chlorophyll helps plants catch sunlight for photosynthesis.
叶绿素帮助植物吸收阳光进行光合作用。
Now you know that photosynthesis helps plants grow and makes the air better for us!
现在你知道光合作用不仅让植物生长，也让空气更加清新了！
