3月7日，李峰驾驶歼十战机在4500米高空进行战术训练时，发动机突然故障。
Li Feng encountered engine failure in his J-10 during tactical training at an altitude of 4500m on March 7.
机器是不可能突然故障的：通常机器在故障前会有告警信号，例如噪音、振动或发热。
This hardly ever happens out of the blue: there are usually warning signs such as noise, vibration or heat.
我的冰箱昨晚突然出了故障。
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