The following figure shows the element tree for datum planes. 下图展示了基准平面的元素树。
It shows that, apart from the usual elements for the tree root and feature type, a datum plane contains the positioning constraints and an optional fit type. 它展示了,除了通常的树根和特征类型等元素,一个基准平面包含位置约束和一个可选配合类型。
Well Log Datum Velocity Correction. 井曲线基准面校正。
All elevations are relative to chart datum. 所有标高均相对于海图基准面。
Some parts of the country are below sea level. 那个国家的某些部分位于海平面之下。
I wanted to watch the sun rising above the sea level. 我想看见太阳在海平面上升起。