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| English | Spanish |
| rapid gravity filter | filtro gravitacional rápido |
| rapid sand filter | filtro rápido de arena |
| rapid test | prueba rápida |
| rapid test Tests performed in the medical field whose results are available very quickly | prueba rápida |
| rapid transit train | tren rápido de tránsito |
| recycling by rapid solidification | reciclado mediante solidificación rápida |