bidirectional counter

例句：

1. 1. The bidirectional counter is used to measure the distance between two points on a map.
   双向计数器用于测量地图上两点之间的距离。
2. 2.In engineering, a bidirectional counter is used to measure the flow of fluids.
   在工程中，双向计数器用于测量流体的流动。
3. 3. The bidirectional counter is essential for ensuring accurate measurements in scientific experiments.
   双向计数器对于确保科学实验中的准确测量至关重要。