zero reference point

例句：

1. 1.The zero reference point is the starting point for all calculations.
   零参考点是所有计算的起点。
2. 2. In this model, the zero reference point is the center of gravity.
   在这个模型中，零参考点是重心。
3. 3.The zero reference point is often used to measure the accuracy of a measurement.
   零参考点通常用于测量测量的准确性。