| appearance as argument number 1 |
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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 |
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