"浮游植物生活在海洋表面，在那里他们把二氧化碳释放到海里，同时放出氧气。
Phytoplankton live at the ocean surface, where they pull carbon dioxide into the ocean while giving off oxygen.
植物在光合作用的时候会释放氧气，但是有机物分解时也需要相同量的氧气。
Plants emit oxygen while they are photosynthesising, but the same amount of oxygen is used up if the carbon compounds they make are broken down.
植物从太阳得到能量并释放出氧气，这是人类和动物在生活中所必需的。
As the plants receive energy from the sun, they give out oxygen, which is necessary for human and animal life.
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