| Subject | English | Spanish |
| met. | d.c.three-electrode arc furnace | horno eléctrico de arco de corriente continua |
| health. | disease of the three D's dermatitis, diarrhoea, dementia | pelagra |
| health. | disease of the three D's dermatitis, diarrhoea, dementia | enfermedad de las tres D dermatitis, diarrea, demencia |
| commun. | three-D radar | radar tridimensional |
| med. | three-D-therapy | terapéutica de las tres D |