semiautomatic keying circuits

例句：

1. 1. The semi-automatic keying circuit is designed to detect and prevent theft in homes.
   这种半自动键控电路旨在检测和预防家庭盗窃。
2. 2. In this project, we used a semi-automatic keying circuit to control the lighting system.
   在这个项目中，我们使用了半自动键控电路来控制照明系统。
3. 3. The semi-automatic keying circuit was responsible for monitoring the security cameras and alerting authorities when necessary.
   这个半自动键控电路负责监控安全摄像头并在必要时通知当局。