如何使用 "datum" 造句

1. The paper introduces examination methods of ground datum points .
介绍了平面基准点的检验方法。
2. Read correspondent datum from display screen .
直接从显示屏读取相关数据。
3. I didn 't have enough datum at hand .
目前我的手头没有足够的资料。
4. Connection measurement of gravity datum points at zhongshan station , antarctica .
南极中山站重力基点联测。
5. The patient 's own picture of what they suffer from is usually the least reliable datum for a diagnosis .
病人对自己病情的描述往往是最不可靠的诊断依据。