单词：datum point
datum point的用法和样例：
例句
- The level at the reference point is zero.参考点的电平是零。
- The point about which moments are computed need not lie on the rod.计算力矩的参考点，并不一定要在杆上。
- The paper introduces examination methods of ground datum points.介绍了平面基准点的检验方法。
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