以下为句子列表：
英文: As crystallization progresses across the temperature gradient, it is possible to move the sample by precise stepper motor control (at specified rate) in the opposite direction so that the crystallization front remains in the field of view.
中文: 当沿着温度梯度方向发生结晶过程的时候，可以向相反方向通过高精度步进马达移动样品，这样可以把结晶前沿始终保持在视域中。
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英文: Power bolt filling device is a set separately measuring and filling system .Adopted high accuracy stepper motor arrive, and bolt to fill, it can finish different measuring ranges through several size of bolts within the mechanical measuring range.
中文: 粉末螺杆充填装置是一套独立的计量充填系统，该装置采用高精度步进电机驱动，螺杆进行充填，在机械计量范围内可由几种大小不同的螺杆完成不同的计量范围。
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