mica disc

例句：

1. 1.The mica disc is used for recording sound waves.
   云母圆盘用于记录声波。
2. 2.The scientist used the mica disc to study the properties of matter.
   科学家使用云母圆盘研究物质的性质。
3. 3. The mica disc was a revolutionary tool in the field of acoustics.
   云母圆盘是声学领域的一项革命性工具。