将“classes"翻译成中文

To control a class calls for all your skills as a teacher.

控制一个班级需要你做老师的所有技能。

The segregation of minority and migrant children from mainstream classes can also constitute an act of racial discrimination.

将少数群体儿童和移徙工人儿童从主流社会等级隔离开来也可构成种族歧视行为。