求翻译：直流电动机因其具有调节转速比较灵活、方法简单、易于大范围内调速、控制性能好等特点，一直在矿用电机车应用领域占有统治地位是什么意思？

DC motors because of its more flexible, adjust the speed, the method is simple, easy speed control a wide range of control and good performance characteristics, has been dominant in the mine electric locomotive applications

DC motor has a variable speed control because of their more flexible, simple, easy-to-large-scale, speed, control, performance characteristics such as mine has been in areas of application in 电机车 possession dominance

Because the direct current motor it has the adjustment rotational speed quite to be nimble, the method simply, in the easy wide range to modulate velocity, the control performance well and so on the characteristics, always holds the dominant status in the mineral product electric locomotive applicat

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