present elevation的意思|示意

With increased elevation above sea level, the flora components of the resource plants present corresponding vertical differentiation patterns.

随着海拔梯度的上升，资源植物的区系成分、性状特征表现出相对应的垂直分异规律。

At present, GPS plane control net is widely applied, but the GPS elevation is not used widely. The people expect that the GPS elevation surveying can take the place of the conventional leveling.

当前，GPS平面控制网已经得到了广泛的运用，但是GPS高程却运用得不够，人们期望着能够用GPS高程测量代替传统的水准测量。

At present, it becomes a research hotspot in the world to study the changes of elevation and mass balance of polar ice sheets by satellite altimetry.

提要采用卫星测高技术研究两极冰面高程变化和物质平衡状态是目前国际研究的一个热点。