1·It is thought that the original crust, especially the metamorphose basement of Precambrian is the base of gold-ore formation.
初始地壳，尤其是前寒武纪的变质基底是金矿密集区形成的物质基础。
2·After the sealing water is dried, the air enters the jar to make the food in the jar metamorphose and decay, and harmful materials such as nitrite is generated.
密封水干涸后，空气进入罐内，使罐内食物变质、腐烂，产生亚硝酸盐有害物质。
3·Burnt rock is come into being coal bed self-ignite and bring wall rock metamorphose and has special engineering geological characteristics.
烧变岩是煤层自燃引起周围围岩变质而形成的，具有特殊的工程地质性质。