(1)国と国の間の勢力の均衡
(2)an equilibrium of power between nations
さらに詳しく
(1)化学反応とその逆反応が等しい割合で進行すること
(2)a chemical reaction and its reverse proceed at equal rates
(1)契約や条約にかかわる人々（や国々）の組織
(2)an organization of people (or countries) involved in a pact or treaty
