Airplane accidents are numerous nowadays, and of course some are attributable to the poor training of the men, the incompetence of the pilots or the deficiencies of the ground-control crews. But sometimes the fault may lie in the quality of the aircraft.

• 现在飞行事故多，当然这里面有部队训练不好、飞行员素质差、地面指挥水平低等问题，但是也要研究飞机质量方面的问题。