serve for thirty yearsとは 意味・読み方・使い方

In contrast to the Taira clan, who had been given high-ranking posts by the Retired Emperor Shirakawa and Emperor Toba, Tameyoshi was given the cold shoulder; having had his request to serve as Governor of Mutsu Province, a post served by his father, MINAMOTO no Yoriyoshi, and his grandfather, MINAMOTO no Yoriie, turned down, he had to serve as Saemon no jo for more than thirty years.発音を聞く 例文帳に追加

平氏が白河院、鳥羽天皇に重用されるのに対して、為義は源頼義、義家と父祖代々任じられた陸奥国守任官の要望も却下され、30余年もの間、左衛門尉のまま冷遇された。 - Wikipedia日英京都関連文書対訳コーパス