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| English | Finnish |
| grouped packaging or secondary packaging | ryhmäpakkaus eli sekundaaripakkaus |
| secondary biotope In the case of disruption of an existing biotope, secondary biotope can be created as a compensation and substitute measure for the loss of the natural one | sekundaarinen biotooppi |
| secondary biotope | sekundaarinen biotooppi |
| secondary combustion chamber | jälkipolttokammio |
| secondary education The years of instruction following elementary school and until the end of high school | keskiasteen koulutus |
| secondary fusion | jalostussulatus |
| secondary pollutant | sekundaarinen epäpuhtaus |
| secondary raw material | uusioraaka-aine |
| secondary scattering | toisen kertaluvun sironta |
| secondary sector The part of a country or region's economy that produces commodities without much direct use of natural resources | teollisuussektori |
| secondary sedimentation | jälkiselkeytys |
| secondary treatment | jälkikäsittely |
| secondary treatment Stage of the process of waste water treatment: following primary treatment by sedimentation, the second step in most wastewater systems in which biological organisms decompose most of the organic matter into a innocuous, stable form | jälkikäsittely |
| secondary treatment | biologinen käsittely |