介绍锅炉给水化学变色防垢剂的使用效果，解决了锅炉失水严重的问题，为锅炉安全运行起到了良好的作用。
Introduce the effect of using chemistry coloring agent quit scale. It solve boiler run off water question and supply well guard effect for the boiler ensure safety in production.
讨论了它们的化学组成对光致变色性能的影响。
The effect of their chemical components on photochromic behavior is discussed.
遗憾的是，正是让树叶变色的化学反应让树叶落地。
Unfortunately, the chemical processes responsible for changing leaf color also make leaves fall.
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