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| English | Portuguese |
| spectacles for viewing three-dimensional films | óculos estereoscópicos para cinema em relevo |
| three-banded plover | borrelho-de-três-golas (charadrius tricollaris) |
| three-banded plover | Charadrius tricollaris (charadrius tricollaris) |
| three-beard rockling | laibeque-de-três-barbilhos (Gaidropsarus vulgaris (Cloquet), Motella tricirrata, Onos tricirrata) |
| three-bearded rockling | laibeque-de-três-barbilhos (Gaidropsarus vulgaris (Cloquet), Motella tricirrata, Onos tricirrata) |
| three-dimensional imaging | imagiologia |
| three "R"s rule | princípio dos 3 Rs |
| three-way tipping 4-wheeled trailer | reboque tribasculante |