People take subway line 8 in Xi'an, Northwest China's Shaanxi province, Dec 26, 2024. The newly opened line 8, the first subway loop line with 37 stations in Xi'an, brought the length of the city ...

A staff member guides a passenger at a station of subway line 8 in Xi'an, Northwest China's Shaanxi province, Dec 26, 2024. The newly opened line 8, the first subway loop line with 37 stations in ...

Each feature of the landscape has a different symbol. Contour lines are lines that join up areas of equal height on a map. By looking at how far apart the contour lines of an area are, we can tell ...