The teacher was accused of favouritism for always giving high marks to a few students in class.

favouritism 是由名词 favourite（最喜爱的人或物）加上后缀 -ism 构成的名词。favourite 来自动词 favour（偏爱、喜爱），-ism 表示"主义、行为或特征"。 favouritism 指"偏袒、偏爱"，特指对某些人或群体给予不公平的优待或特殊照顾的行为。