changes within a certain range
changes within a certain range
一定范围内的变化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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By adjusting the axial position of the roller shelf and the pump body, gap between pressure-bearing pipes changes within a certain range, thereby the application scope of the pump head is expanded.
该蠕动泵通过调节滚轮架与泵体的轴向位置，使压管间隙在一定范围内变化。从而扩展了泵头的使用范围。
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