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Lungs for Breathing

所属专辑： About the Evolution of Life
日期： 2022-10-28
简介： Mom takes Kaikai and Xinxin to have fun at the park. Kaikai and Xinxin think that the air is very refreshing. Therefore, Mom explains functions of the lung, the organ of obtaining oxygen in human body, as well as the working mechanism of exchange between oxygen and carbon dioxide in lung.
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