报告说，长期缺乏检查员妨碍了管道安全局开展工作。
The report said the pipeline agency was hampered by a chronic inspector shortage.
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。
Regulators typically inspect pipeline operators once every three to five years, according to the agency.
腐蚀问题在管道安全局看来是不同于设备故障的。腐蚀是导致泄漏的第二大主导因素，在统计的时间段内所占比例接近1/4。
Corrosion, which the agency considers to be different from equipment failure, is the second leading cause, and to blame nearly one-quarter of the time.
腐蚀问题在管道安全局看来是不同于设备故障的。腐蚀是导致泄漏的第二大主导因素，在统计的时间段内所占比例接近1/4。
Corrosion, which the agency considers to be different from equipment failure, is the second leading cause, and to blame nearly one-quarter of the time.
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