颜色、符号、线条、以及底纹都是可选的。
The color, symbols, line style, and shading are user-selectable.
无论穿什么，请确保穿着舒服，鞋底纹理完好。
Whatever shoes you put on, make sure they're comfortable and still have good grip.
但是，通过在样式中定义颜色，可以定义更好的灰色底纹。
By defining the color in our styling, however, we could at least make an effort to define a better shade of gray.
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