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(documentation populationDensity EnglishLanguage "The number of people per unit area in a given area, as an estimate or approximation.")	Mid-level-ontology.kif 31723-31724
(domain populationDensity 1 GeographicArea)	Mid-level-ontology.kif 31720-31720	populationDensity 的 1 数量是地理区域的 instance
(domain populationDensity 2 RealNumber)	Mid-level-ontology.kif 31721-31721	populationDensity 的 2 数量是实数的 instance
(domain populationDensity 3 UnitOfArea)	Mid-level-ontology.kif 31722-31722	populationDensity 的 3 数量是 UnitOfArea 的 instance
(instance populationDensity TernaryPredicate)	Mid-level-ontology.kif 31719-31719	populationDensity 是三元谓语的 instance