the class sizes are kept small with less tan 20 students.

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theclasssizesarekeptsmallwithlesstan20students.theclasssizesarekeptsmallwithlesstan20students.thecla

the class sizes are kept small with less tan 20 students.
the class sizes are kept small with less tan 20 students.

the class sizes are kept small with less tan 20 students.
班级的规模控制得很小,不到20个学生
tan 应为 than