名词
中文翻译：互惠计数器
同义词：
['reciprocal counter', 'reciprocal counterpart']
例句：
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1. This reciprocal counter measures the amount of gas exchange between two organisms.
这个互惠计数器测量了两种生物之间的气体交换量。
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2. The reciprocal counter is used to measure the distance between two points on a map.
这个互惠计数器用于测量地图上两点之间的距离。
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3. The reciprocal counter was invented by a scientist who wanted to study the effects of gravity on objects.
这个互惠计数器是由一位科学家发明的，他想研究重力对物体的影响。