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| English | Spanish |
| tertiary consumer | consumidor terciario |
| tertiary consumer | consumidor de tercer orden |
| tertiary lagoon | laguna de lodos terciarios |
| tertiary packaging | envase terciario |
| tertiary packaging | envase de transporte |
| tertiary sector The part of a country or region's economy that produces services or assets lacking a tangible and storable form | sector terciario |
| tertiary treatment | tratamiento terciario |
| tertiary treatment The process which remove pollutants not adequately removed by secondary treatment, particularly nitrogen and phosphorus; accomplished by means of sand filters, microstraining, or other methods (referring to wastewater treatment) | tratamiento terciario |
| tertiary waste treatment | tratamiento terciario de aguas residuales |
| tertiary water treatment | tratamiento avanzado del agua |
| tertiary water treatment | tratamiento terciario del agua |
| transport packaging or tertiary packaging | envase terciario o envase de transporte |