平均使用寿命为3年。
这样的建筑需要频繁维护且经常遭受损坏，平均使用寿命仅十年。
Such buildings require regular maintenance, are often prone to damage and last on average only 10 years.
该研究结果对于现场提高钻柱的平均使用寿命具有重要的工程理论指导意义。
It is significant for adjusting drill pipe sequence to improve average life of drill string.
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