Cave is a detailed explanation of limestone dissolved by water containing carbonic acid gas and partially disappeared, which refers to a natural cave.
Word decomposition
Dragon is a legendary magical animal with scales, horns, walking, flying, swimming, making clouds and rain: dragon boat. Dragon lantern and dragon palace Dragon pony (good horse, refers to a talented teenager). Make the finishing point. The dragon is flat and the tiger is alive. Paleontology refers to some huge explanation caves, caves with limbs, tails or wings, deep caves, caves: caves. Cave. Dong Xiao. Empty. Loopholes. Dongfudong. Make a hole, make a hole (penetrate): A wolf makes a hole in it. Thorough and clear: insight. Go through. Used instead of zero when talking about numbers. Radical: beech.