face-discharge bit

例句：

1. 1. This device is used to detect the facial expression of a person.
   这个设备用于检测人的表情。
2. 2. The researcher found that the face-discharge bit could be used to monitor the heart rate.
   研究者发现，面部放电块可以用来监测心率。
3. 3. During the experiment, the face-discharge bit was attached to the subject's forehead.
   在实验期间，面部放电块被附着在受试者的额头上。