What does it mean that the sky in Lianyungang is not too blue?

"The sky in Lianyungang is not too blue" means that in Lianyungang, the color of the sky is not as blue as people usually think. This is a common natural phenomenon, which may be caused by factors such as air pollution and weather conditions. In Lianyungang, for some reasons, the color of the sky may not be as blue as people think, so this statement came into being.