Additionally cactus is the climate fighting heat that gets used to desert area, shut air hole by day, lest moisture evaporates, arrived nightly open air hole, absorb carbon dioxide, expiration oxygen.

• 另外仙人掌为适应沙漠地区的干热气候，白天将气孔关闭，以免水分蒸发，到了夜间则打开气孔，吸收二氧化碳，呼出氧气。