英语翻译Since the first acid-gas injection operation in 1990,51d

英语翻译Since the first acid-gas injection operation in 1990,51different injection sites have been approved,of which 44 arecurrently active.One operation was not implemented,three wererescinded after a period of operation (either because injectionvolumes reached the approved limit or because the gas plantproducing the acid gas was decommissioned) and three siteswere suspended by the regulatory agency because of reservoiroverpressuring.大致意思准确,通顺的,