railway workers wearing high visibility clothing repairing railway track side view - 火車軌 個照片及圖片檔英國, 職業, 修理
engineers and technicians are inspecting and surveying the construction of railway tracks for construction of transportation systems, engineering concepts, construction, infrastructure systems. - 火車軌 個照片及圖片檔建築地盤, 建築業, 建築工人