The higher the degree of urbanization, the more concrete and steel rods there are around us, the less daily contact we can have with green nature. The functions of trees placed in concrete are still limited, though, while being able to enjoy the cool breeze of nature and breathing fresh air are things that have become wishes in our sphere of life.
都市化程度愈高，水泥、鋼筋愈多，日常生活中能接觸的綠色愈少，水泥地上的樹能發揮的功能有限。生活圈中，勝暑享受自然涼風，呼吸乾淨的空氣已成奢望。