而从我们人类的脸在愤怒、兴奋或高兴时也会变红这一点来看，对这种颜色的识别对视觉交流也有辅助作用。
And as evident from humans' tendency to turn red when angry, aroused or upset, such color recognition assists visual communication, too.
副作用是导致牙齿变红。
最常见的副作用是刺激或变红。
酸是一种化合物，它在溶于水时具有强烈的气味，它对金属具有腐蚀的作用，并且它具有把某些蓝色植物染料变红的能力。
Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, the ability to turn certain blue vegetable dyes red.
酸是一种化合物，它在溶于水时具有强烈的气味，它对金属具有腐蚀的作用，并且它具有把某些蓝色植物染料变红的能力。
Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, the ability to turn certain blue vegetable dyes red.
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