According to the statistics data, the maintenance cost of the aero-engine accounts for more than 30 percent of the total operating cost of airlines, which reveals much controllable margin.
据统计，航空发动机维护成本占据航空公司直接运营成本的三分之一强，有很大的控制余量。
According to the statistics data, the maintenance cost of the aero-engine accounts for more than 30 percent of the total operating cost of airlines, which reveals much controllable margin.
据统计，航空发动机维护成本占据航空公司直接运营成本的三分之一强，有很大的控制余量。
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