maymay552000
你好!结盟alliance 英[əˈlaɪəns] 美[əˈlaɪəns] n. (国家、政党等的) 结盟,同盟,联盟,联合; 联姻; 同盟条约; 同盟者; [例句]The two parties were still too much apart to form an alliance.两党分歧甚大,还远未能结成同盟。
jiujieayiyua
the intersection of A and B“A和B的交集” the union of A and B“A和B的并集” 举例: The intersection of set A and set B is empty. 集合A和集合B没有交集。/ 集合A交集合B是空集。 Set P is the union of set K and set S. 集合P是集合K和集。