color bar
noun🔊/ˈkʌlə bɑː(r)/
🔊/ˈkʌlər bɑːr/
(US English) (British English colour bar)
(US English also color line)
[usually singular]a social system that does not allow black people the same rights as white people 肤色障碍；种族歧视；种族障碍