Regulators typically inspect pipeline operators once every three to five years, according to the agency.
按照管道安全局的说法，监管机构通常每3- 5年对管道运营商检查一次。
Pipeline operators use transmission lines to transport energy from their source to end users - often several states away.
管道操作者用这条管道从源头输送能源到几个终端，通常是几个州以外的地方。
And the percentage of dangerous liquids recovered by pipeline operators after a spill has dropped considerably in recent years.
近些年，泄漏发生后由输油管道运营商回收的危险液体的比例却呈明显下降趋势。
Large pipeline operators such as ExxonMobil Corp., BP Plc and Kinder Morgan Inc. — and not Koch — accept free services from the foundation, Smalley says.
斯莫利说，大的石油管道运营商诸如埃克森美孚石油公司、英国石油公司、康德·摩根石油公司——没有科赫公司——都接受了基金会的免费服务。
Large pipeline operators such as ExxonMobil Corp., BP Plc and Kinder Morgan Inc. — and not Koch — accept free services from the foundation, Smalley says.
斯莫利说，大的石油管道运营商诸如埃克森美孚石油公司、英国石油公司、康德·摩根石油公司——没有科赫公司——都接受了基金会的免费服务。
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