@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://www.irandoc.acir/onto/irandoc/CHMTR000033>
  skos:prefLabel "آلاینده‌های نوع دوم"@fa, "secondary pollutants"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/CHMTR000031> .

<http://www.irandoc.acir/onto/irandoc/CHMTR000031>
  skos:broader <http://www.irandoc.acir/onto/irandoc/CHMTR000033> ;
  skos:prefLabel "گوگرد تری‌اكسید"@fa, "sulfur trioxide"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .