Additionally, Dragon Runner SUGV, gives operators field-changeable frequency capabilities, using analogue or digital radio options.

此外，通过模拟或数字无线电选项，“龙信使”可以为操作人员在野外环境提供可变频通信能力。

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Gears of first stage are changeable so that the operator can change the gear ratio based on current field condition.

第一级传动齿可变，驾驶员可根据电流与磁场情况来改变齿数比。

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Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.

介绍两种快速测量单模光纤模场半径的方法及其测量装置——可变孔径法和移动圆孔法；

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The Sun's changeable magnetic field is generated at the boundary between these two layers, where strong electric currents flow.

BBC: Sun, Trace