When a tree grows in the forest and gives off oxygen and soaks up carbon dioxide, and it dies and it falls to the forest floor, it gives that carbon dioxide back to the atmosphere or into the ground.
当一棵树长在森林，放出氧气 吸入二氧化碳， 死亡，倒在树林里 它把二氧化碳又还回大气或者大地