delay(延误)，missed the flight, switch flight (换乘航班)，mechanical problems(机械故障)，wait for further notice。
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大约在西元前330年，亚里士多德在著作《机械问题》（《Mechanical Problems》）里的第十八个问题，专门研讨“复式滑轮”系统阿基米德贡献出很多关于简单机械的知识，详细地解释滑轮的运动学理论。
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outer mechanical problems 外部机械故障
outer r mechanical problems 外部机械故障
key mechanical problems 关键力学问题
major mechanical problems 关键力学问题
mechanical optimal problems 机械最优化问题
Having fewer parts makes the electric car cheaper to maintain and less likely to have mechanical problems.
由于零件更少，因此电动汽车的保养更加便宜，出现机械故障的概率也降低了。
Some of the accidents are due to mechanical problems.
有些车祸是由于机械问题。
Bad weather or mechanical problems could leave you stranded.
恶劣的气候或机械故障都可能让你受困。
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