交通标志使用不同的标号，颜色及形状以方便司机辨认。
Signs use different symbols, colours and shapes for easy identification.
图的边可区别数是破坏图对称性的最小可区别的边标号数（颜色数）。
The edge distinguishing number of a graph G is the minimum number of the distinguishing labelings (colors) of the edges in G for which destroys the symmetries of G.
同一颜色系列标号从小到大，无限光学厚度依次减低；从A至D标号，并非简单的依次减低，而是存在交叉现象。
The infinity optical thickness gradual decreased in the same shade mark from1to4, and from A to D the results was not simple.
同一颜色系列标号从小到大，无限光学厚度依次减低；从A至D标号，并非简单的依次减低，而是存在交叉现象。
The infinity optical thickness gradual decreased in the same shade mark from1to4, and from A to D the results was not simple.
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