...de Saint-Aignan, aide-de-camp in perpetuity, carried to La Valliere at the risk of foundering his horses... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...The Negroes receive noinstruction on the nature, sacredness, and perpetuity of theinstitution; at any rate they are far from being duly impressed withthese things...
Booker T. Washington 「The Negro in the South」
...This isnot perfection, not even perpetuity...
Henry Warren 「Recreations in Astronomy」
ランダム例文：
archaeologist residual hint
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