细看下面的解释，你就会明白他们的区别： category a group of people or things with particular features in common （人或事物的）类别，种类 class ： Students over 25 fall into a different category. * 25 岁以上的学生属另一类。 ◊ The results can be divided into three main categories. 结果可分为三大类。
variety 1 ~ (of sth) several different sorts of the same thing （同一事物的）不同种类，多种式样 ： There is a wide variety of patterns to choose from. 有种类繁多的图案可供选择。 He resigned for a variety of reasons. 他由於种种原因辞职了。 ◊ This tool can be used in a variety of ways. 这一工具有多种用途。 ◊ I was impressed by the variety of dishes on offer. 所供应的菜肴之丰盛让我心动。
2 [U] the quality of not being the same or not doing the same thing all the time 变化；多样化；多变性 diversity ： We all need variety in our diet. 我们都需要饮食多样化。 ◊ We want more variety in our work. 我们希望我们的工作多变点儿花样。
