favouritism
noun [ U ] UK disapproving (US favoritism) uk/ˈfeɪ.vər.ɪ.tɪ.zəm/ us/ˈfeɪ.vər.ə.tɪ.zəm/
（尤指当权者不公平的）偏爱，偏袒
unfair support shown to one person or group, especially by someone in authority
A parent must be careful not to show favouritism towards any one of their children. 家长必须注意不要偏爱任何一个子女。