letter disc

例句：

1. 1. The computer's hard drive is a letter disc that stores all the data on it.
   计算机的硬盘是一个存储所有数据在上面的字母盘。
2. 2.The teacher used a letter disc to demonstrate how to read and write in Chinese characters.
   老师使用一个字母盘来演示如何阅读和书写汉字。
3. 3. The engineer designed a new type of disc for storing large amounts of data efficiently.
   工程师设计了一种新类型的磁盘，用于高效地存储大量数据。