The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.
粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。
2
The ancient building waterproof and prevent erosion of harmful substances, while protecting the historic buildings original appearance.
古建筑防水和防止有害物质侵蚀，同时保护古建筑原貌。
3
The ancient carbonate ancient karst of Well TZ16-TZ24 area can be divided into two main categories, the erosion karst and deep karst.