cu km是什么度量衡单位?
NZ’s largest lake, Lake Taupo, is the fiery
heart of the North Island, lying in a caldera formed by one of the biggest volcanic eruptions ever. The eruption occurred more
than 26,500 years ago, throwing out 800 cu km of ash and pumice, making Krakatoa (8 cu km) look like a pimple. The surrounding
area is still volcanically active and, like Rotorua, has fascinating thermal areas.