看看这些红色矿物颗粒, 它们具有双晶以及完全解理.Look at these grains. They have twins and perfect cleavages.可用区内不允许存在电学或光学双晶.N o electrical or optical twinning shall be allowed in usable zones.斜长石通常呈白色,具有完全解理和聚片双晶.Plagioclase is usually white ...

“双晶”的英语可以翻译为：macle，[化] bicrystals，crystal twin ...