求翻译：在1939年，由一名叫CYR得博士在一个会议上提出将校车的颜色进行改变，最终校车改成了黄色，因为黄色是最容易看到并且有一定的警示功能，这有大大提升了校车的安全性。是什么意思？

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In 1939, by a man named Dr. CYR was presented at a conference on school buses, and ultimately to change the color changed to a yellow school bus, because yellow is the easiest to see and there is a certain degree of warning function, this will greatly enhance the safety of school buses.

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In 1939, by a man named Dr CYR raise are verified in a meeting to change the color of the car, eventually changed school bus yellow, because yellow is the most easy to see and have a certain function, which has greatly enhanced the safety of school buses.