Difference,是different的名词形式,在考试中常出现不同意义下单复数的差别
(1) 表示差别,差异;分歧,不和的时候,可数
There are many differences between living in the city and living in the countryside.
They have many differences in the agreement.
(2) 表示差额时,不可数 名词
The difference between 5 and 8 is 3.