日落时分，土木工程师在铁路施工现场进行勘测

-up rear view of a civil engineer in a hard hat and safety vest looking through a theodolite (surveying instrument) on a tripod. In the background, a colleague holds a prism pole on the railway tracks, with a steel bridge structure behind them. The team is working at the construction site during a golden sunset or sunrise, symbolizing infrastructure development, precision measurement, and civil engineering.