You can write a cave. Because the cave dwelling was the place where the ancient working people lived, its windows were relatively small, the internal space was not large enough, and it was deep. Generally, it is dug against the cliff head, with a thick soil layer, which is warm in winter and not hot in summer. Now some people in remote rural areas and poverty-stricken areas still live in this cave, so I think it should be written as a cave.

"Huai Nan Zi Tai Xun": "Everything has a perforated louver, and a tree has a chiba." ? Han Bangu's Zhi Yi: "A hole is flawed, bad and depressed, and like a flooded scorpion." ? "Er Ya Shi Le" and "Guo Pu" are "released after a big delay". Note: "The ruler is made of bamboo, with a length of four inches and a circumference of three inches. Out of the hole, one inch and three points, the name is blowing.

"? " Guan Xu: "Those who benefit from one hole are invincible; Those who go out from the second hole will not be defeated. "? " "Shu Weak People": "If you get a hole, there will be many countries; Ten holes, the country lacks things. "? " "Huai Nan Zi's Original Tao Xun": "The sum of all things is to read a hole; The roots of Pepsi are all in one door. "? Zheng Sheng Shi Wei Yan: On Posts: "A hole is far away. "? Such as: a one-hole kiln.