electronic keying unit

例句：

1. 1.The electronic keying unit is used to secure the data transmission line.
   电子密钥单元用于加密数据传输线路。
2. 2. The electronic keying unit is a crucial component in the security system.
   电子密钥单元是安全系统的关键组件。
3. 3.The electronic keying unit was developed to improve the efficiency of data encryption.
   电子密钥单元被开发出来以提高数据加密的效率。