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netrelease of oxygen：氧的淨放出。
netintake of carbon dioxide：二氧化碳的淨吸入。

Under sunlight, plants undergo photosynthesis and respiration simultaneously, andthe rate of photosynthesis is faster than that of respiration.
在陽光下，植物同時進行光合作用和呼吸作用，而光合作用的速率較呼吸作用快。

Under sunlight, plants thus intake more carbon dioxide and release more oxygenin photosynthesis, while they intake less oxygen and release less carbon dioxide.Therefore, there is net release of oxygen and net intake of carbon dioxide.
故此在陽光下的植物，在光合作用中吸入較多的二氧化碳和放出較多的氧氣，而在呼吸作用中吸入較少的氧氣和放出較少的二氧化碳。因此，氧有淨放出，而二氧化碳有淨吸入。

For example, consider a plant under sunlight for a certain period. In the period, the plant intakes 44 g of carbondioxide and releases 32 g of oxygen in photosynthesis, while it intakes 8 g andoxygen and releases 11 g of carbon dioxide in respiration.
Net release of oxygen = (32 g) - (8 g) = 24 g
Net intake of carbon dioxide = (44 g) - (11 g) = 33 g
舉例來說，考慮一棵放在陽光下一段時間的植物。在這段時間內，該植物在光合作用中吸入 44g 的二氧化碳和放出 32g 的氧，而它在呼吸作用中吸收 8g 的氧和放出 11g 的二氧化碳。
氧的淨放出 =(32 g) - (8 g) = 24 g
二氧化碳的淨吸入 = (44g) - (11 g) = 33 g

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