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

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英语翻译
Since the first acid-gas injection operation in 1990,51
different injection sites have been approved,of which 44 are
currently active.One operation was not implemented,three were
rescinded after a period of operation (either because injection
volumes reached the approved limit or because the gas plant
producing the acid gas was decommissioned) and three sites
were suspended by the regulatory agency because of reservoir
overpressuring.
大致意思准确,通顺的,
意思已很明了,望采纳.
自1990年第一次酸—气体注射作业起,业已批准51个不同的注射场所,其中44处目前还在起作用.一处操作没有实施,三处在一段时间的运行后被废除(或者是因为注射量达到核定限额或者因为生产酸气的气厂退役),还有三处被监管机构因储藏库超压而暂停.