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来源：雅诚德英语网
It is the urgent problem to be solved how to improve the safety level of pipeline operation and decrease the accident-happening rate.
如何提高管道系统的安全运行水平，降低事故发生率，已是刻不容缓亟待解决的问题。
It is the urgent problem to be solved how to improve the safety level of pipeline operation and decrease the accident-happening rate.
如何提高管道系统的安全运行水平，降低事故发生率，已是刻不容缓亟待解决的问题。