Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area.
早在20世纪初,一些停车标志是黄色的,因为在光线不好的地方很难看到红色标志。
This sign appeared in every food area around the airport.
机场的每一个饮食区都有这个标志。
Successful patterns are derived from many years of successful practice in given areas and are a sign of maturity for that area.
多年以来某些领域的成功实践衍生出了一些成功模式,它们是相关领域的成熟度的标志。
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