He's colorblind and can't distinguish between red and green easily.

distinguish 是动词，意思是"区分、辨别"，指能够识别出事物之间的不同之处。这个词由前缀 dis-（表示"分开"）和 stinguere（拉丁语词根，意为"刺、标记"）组成，字面意思是"通过标记来分开"。