英语释义
1. one that detects: such as
2. a device for detecting the presence of electromagnetic waves or of radioactivity
3. a rectifier of high-frequency current used especially for extracting the intelligence from a radio signal
4. a device that can tell if a substance or object is present a device that detects the presence of something
5. one that detects especially a device for detecting the presence of electromagnetic waves or of radioactivity