... major component exchange；主要零部件的交换 major engine failure；发动机大故障 major improvement；主要改进 ...
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major engine failure
发动机重大故障
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The monographic analysis has been focussed on the repeated failure and major failure. The reliability and maintainability index of the given engine have been evaluated.
同时，对重复性故障及重大故障进行了专题分析，就维修性与可靠性指标进行了确定与评估。
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