名词
中文翻译：上下限计数器
同义词：
['upper and lower counter', 'upper and lower limit counter']
例句：
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1. The up-down counter is used to measure the height of objects.
这个上下限计数器用来测量物体的高度。
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2.The up-down counter was used to control the flow of materials.
这个上下限计数器用来控制物料的流动。
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3.The up-down counter was used to check the accuracy of measurements.
这个上下限计数器用来检查测量的准确性。