The second set consisted of patina ― a chemical film encrustation on one of the limestone boxes.
第二套样本中包含有铜绿――在一个石灰石盒子上附着的一种化学物质。
2
Using quartz sand, limestone, dolomite and other natural mineral as the main raw material, with some soda, borax etc chemical raw materials melting into glass.
采用石英砂、石灰石、白云石等天然矿石为主要原料,配合一些纯碱、硼砂等化工原料熔成玻璃。
3
Using quartz sand, limestone, dolomite and other natural mineral as the main raw material, cooperate with some soda, borax etc chemical raw materials melting into glass.