樹葉和樹木

樹葉和樹木是在晚上吸取二氧化碳,
然後在白天釋放出氧氣，
所以在馬路旁多種樹木對人體是有好處的.

樹葉和樹木也是在天光放出氧氣

Tree will proceed Photosythese in the present of sunlight (Or light) through their leaves, also water is also the eseential elements for the process.
Therefore, CO2 will be absorbed by the leaves and O2 will be discharged in the day time.
The process will be reverted at night, CO2 will be discharged and O2 will be absorbed.