Translation is the communication of the meaning of a source-language text by means of an equivalent target-language text. The English language draws a terminological distinction (not all languages do) between translating (a written text) and interpreting (oral or sign-language communication between users of different languages); under this distinction, translation can begin only after the appearance of writing within a language community.
European engineers have developed a self-regulating reversible inflow control device (ICD) to maximise oil production and shut off unwanted water and gas from production wells.