A speck in a visual field need not be red, but it must have a colour; it has, so to speak, a colour space round it.

视域里的一个斑块，不一定是红的，但是它必定有某种颜色：可以说，它周围有一个颜色空间。

youdao

The "our colour and the contents of bran speck are the importance indexes for checking the quality of flour."

前言： 粉色、麸星是检验面粉质量的重要指标，改善面粉色泽是各面粉厂共同关心的问题。

youdao