那位军人以稳健有力的步伐行进，一看就是训练有素的健步者。

The soldier marched with firm strides, clearly a well-trained ___stepper.

这台3D打印机使用步进电机来控制打印头的精确移动。

This 3D printer uses a ___stepper motor to control the precise movement of the print head.

每天使用踏步机锻炼二十分钟可以增强心肺功能。

Using the ___stepper for twenty minutes daily can improve your cardiovascular fitness.