(1)集合元素的判定和子集判定运算 (2)求集合的补集 (3)集合的混合式运算表达求值 (4)集合的元素类型推广到其他类型，甚至任意类型-(1) the determination of the collection element, and the subset determination computing (2) the complementary set of requirements (3) collection of hybrid-type computing expre