普劳德发现，相对班上没有或者有很少女生的班级而言，当班上女生人数较多时，男生的英语成绩总是会下降10%。
Boys consistently perform up to a tenth of a grade worse when they study English with high Numbers of girls as opposed to few or no girls, Proud found.
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.
一些教育家把学生表现标准的下降与班级人数的增加联系在一起。
Some educators have related the drop in the standard of students' performances to the increase in class size.
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