在钻具失效事故中，钻铤的疲劳失效尤为突出。
In the event failures of boring tools, the fatigue failure of the drill collar is especially prominent.
门机金属结构的失效事故，后果往往非常严重。
The consequence caused by crane's metal structure to lose efficacy is very serious.
油气管线失效事故会给周围人员和设备造成重大危害。
The pipeline accident can cause damage to the people and equipments around.
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