112学区的北岸学校很幸运，可以有别的选择，维持其传统的小规模课堂——在2009年小学班级平均人数为19人，中学为21人。
North Shore school District 112 was fortunate to have other options and will maintain its traditionally low class sizes - which in 2009 averaged 19 in elementary grades and 21 in middle school.
如果你在小地方学得好，专注于班级规模，例如班级的平均人数或者在20人以下班级的百分比，或者看师生比例。
If you learn best in small Settings, focus on measures of class size, such as average class size or percentage of classes with enrollment below 20, or on student-faculty ratio.
然而，通常由于人均成本问题，班级人数需要控制在平均15位员工左右。
However, usually due to the cost per head issue, average class sizes are about 15 staff.
由于班级人数上升，因此学生的平均年龄下降了。
As the class size goes up, so the average student age goes down.
由于班级人数上升，因此学生的平均年龄下降了。
As the class size goes up, so the average student age goes down.
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