zhè / tiáo / tiě / lù / chuān / guò / yī / mǎ / píng / chuān / hěn / shǎo / xū / yào / xiū / jiàn / suì / dào

这条铁路穿过一马平川，很少需要修建隧道。

This railway crosses a broad plain, so it rarely needs tunnels.