high-speed railway(The term "high-speed traffic" encompasses all trains running at speeds over 200 km/h but also trains running at 200 km/h if the terrain, population density or economic reasons do not justify higher speeds)
highland ecosystem(The interacting systems of the biological communities and their non-living surroundings in regions of relatively high elevation, typically characterized by decreased air pressure and temperature, reduced oxygen availability and increased isolation)
blast furnace(A tall, cylindrical smelting furnace for reducing iron ore to pig iron; the blast of air blown through solid fuel increases the combustion rate)