They had designs on them: squares and triangles and circles of pink and green silk.
它们上面有各种图案：用粉色和绿色的丝绸做成的正方形、三角形和圆圈。
Street signs in the United States follow a simple pattern of shapes and colors: Yellow triangles are cautionary, red octagons are imperatives, and green rectangles are informative.
在美国，街道上的标志牌采用了形状和颜色的简单组合模式，即黄色三角形表示警告，红色八角形表示强制，绿色长方形表示通告。
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