cardinality of a fuzzy set

例句：

1. 1.The cardinality of the set is 30.
   这个集合的基数是30。
2. 2. The cardinality of the set is determined by the number of elements.
   集合的基数由元素的数量决定。
3. 3.The cardinality of a set is defined by its cardinality function.
   一个集合的基数由其基数函数定义。