Unlike some places on earth, Hong Kong does have four seasons. Hence, people in Hong Kong really can enjoy and take photos in spring. During mid-spring in Hong Kong, nature has re-vitalized in an un-even pace. As shown in this photo, leaves have sprung out on some trees while some other trees still do not have leaves. The north-east winds that carried the polluted air from the industrial region in China to Hong Kong are being replaced by the easterly winds so that the blue sky begins to come back Hong Kong. Because of the polluted air, Hong Kong has only a few days with blue sky in the spring each year. The day taken this photo has the most beautiful sky so far this year in Hong Kong. I wish that this photo can encourage us to protect the environment so that such beautiful sky will come again in spring for many years to come.