federation
n
1 [C] union of states in which individual states retain control of many internal matters but in which foreign affairs, defence, etc are the responsibility of the central (federal) government 联邦.
2 [C] similarly organized union of societies, trade unions, etc (社团、 工会等的)联合会.
3 [U] action of forming a federation 结成联邦政府; 联盟.
It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.