surveying and sketching of geological map

例句：

1. 1.The survey team spent several days mapping the terrain before starting their project.
   调查队花了几天时间测绘地形后才开始他们的项目。
2. 2.The geologist used a handheld device to sketch the fault lines on the map.
   地质学家使用手持设备在地图上勾勒出断层线。
3. 3. The engineer conducted a detailed survey of the construction site before beginning the excavation work.
   工程师对施工场地进行了详细的测绘，然后开始挖掘工作。