the activity of designing and constructing and operating railroads
造句
用作名詞(n.)
Energetically railroading development is important promoting condition of west exploitation and economic development. 大力開(kāi)展鐵路建設(shè)是實(shí)施西部大開(kāi)發(fā)，促進(jìn)西部經(jīng)濟(jì)發(fā)展的重要條件。