vary between A and B

问题描述:

vary between A and B
eg class numbers vary between 25 and 30

 


eg class numbers vary between 25 and 30 这句话是:

例:班级数介於二十五与三十之间不等.




而 vary between A and B是: 

介于A与B之间变化不一 (依情况而定的意思).