a natural substance like glass that breaks easily into thin layers and is not damaged by heat , often used in electrical equipment
发音
例句
1. It could not pass through material impervious to water such as mica. 它不能通过云母这样的不透水的物质。 2. Because of its layered structure, mica is fissile. 因为是层状结构,云母很容易分成片。