班长 class monitor
副班长 assistant class monitor
班委会 class committee
文艺委员 commissary in charge of literature and art
体育委员 commissary in charge of sports
生活委员 commissary in charge of general affairs
学习委员 commissary in charge of studies
组织委员 commissary in charge of organization
宣传委员 commissary in charge of publicity
劳动委员 commissary in charge of physical labour
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