And as evident from humans' tendency to turn red when angry, aroused or upset, such color recognition assists visual communication, too.

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。

A visual indicator shows if the collection has ended successfully or failed (the progress bar is green when collection is completed with no errors, or red when it fails).

一个可视指示符显示收集成功完成还是失败(当收集完成且没有出现错误时，进度条为绿色；而收集失败时则为红色)。

When melamine is present, the color of the solution changes from red to blue within seconds and can be measured both by visual inspection and spectrophotometry.

当存在三聚氰胺时，溶液的颜色将在几秒钟之内迅速从红色变为蓝色，而且能够同时通过肉眼观察和分光光度法检测到。