He's colour-blind and can't distinguish between red and green easily.

distinguish 是动词，意思是"区分、辨别"，由前缀 dis-（表示"分开"）和词根 stinguere（拉丁语，意为"分开、区分"）组成。这个词强调通过观察或感知来识别事物之间的差异。