受动器

例句：

1. 1. The device is designed to detect the presence of a specific chemical in the air.
   该设备旨在检测空气中特定化学物质的存在。
2. 2. The sensor can detect changes in temperature and humidity.
   传感器可以检测温度和湿度的变化。
3. 3. The receiver is responsible for converting the audio signal into a usable format.
   接收器负责将音频信号转换为可用格式。