Decrease the size, and the rotation rate goes up.

如果减少尺寸，转速就增加。

There is a fear of losing teachers if class sizes decrease when students leave suddenly, said Dora Espinoza.

多拉·埃斯皮诺莎说，如果学生突然离开，班级规模就会变小，学校担心会失去老师。

The next most common issue was the decreasing size of the traditional student population, meaning students between 18 and 24 years old.

第二个最常见的问题是传统学生人数在减少，这是指18至24岁的学生。

And I wish they would decrease the size of classes - it's not easy doing lessons in laboratories with big groups and it must be even worse in the poorer schools!

我也希望他们能减少班级的规模，—在实验室里带着一大群学生上课不容易，要是在更穷的学校里情况一定会更糟糕。