(used with a sing. verb)The branch of political science that is concerned with the foreign affairs of and relations among countries.（与单数动词连用）国际关系学：以国家的外交事务及国家间关系为研究对象的一门政治学分支
(used with a pl. verb)Foreign affairs; relations among countries.（与复数动词连用）国际关系：外交事务；国家之间的关系