The issue strained relations between the two nations.
その問題は両国の関係をこじらせた
the medical profession
〔集合的に〕医療関係者
the mutual dependence of practice and theory
実践と理論の相互依存関係
the parties concerned
利害関係者，当事者
The press gathered around the senator.
報道関係者はその議員を取り巻いた
The problem has (something) [is] to do with security.
その問題はセキュリティーと関係ある
The problems of inflation and unemployment are not independent of each other.
インフレと失業は無関係ではない
the relation between mother and child
母子関係（◆無冠詞）
the relation between statistics and reality
統計と現実の関係
the relationship between diet and health
食事と健康の関係
