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In most of the area in China, the trees alongside the streets will be painted by a kind of white liquid in the winter, the limewater. This is a traditional way to protect the trees, keeping them from insects, bacterias and coldness. With the process of urbanization in China, there are less and less categories and quantities of birds living in the cities. As a result, the propaganda for the public interests for birds can be conducted via the road trees.At the same time, the limewater fades away with the returning of spring, reminding people wondering “where are the birds when spring comes?” Thus, a deep reflection can be aroused.