A number of federal agencies have been investigating the incident thought to be due to corrosion. 一些联邦警署一直在调查当中，他们认为该事件是由于油管腐蚀所引起的。
Summarizing the variation law of tubing corrosion occurrence and development from various corrosion phenomena is a key link for solving the problem of tubing corrosion. 怎样从这些花样繁多的腐蚀现象中，总结出油管腐蚀发生与发展的变化规律，是解决油管腐蚀问题的关键环节。
