Nan Zhubin spoke, waving to Huang Xin.
Huang Xin cooperatively tossed up a phone and a stand.
Nan Zhubin smoothly placed the phone on the stand in front of Lin Lulin, simultaneously turning on the camera aimed at the middle-aged professor.
By this time, Huang Xin had already completed linking the phone screen with the laptop through some operations.
——Thus, Lin Lulin's face riddled with creases instantly appeared on the big screen before everyone.
"Next, when I ask questions, I will use this phone to record the teacher's face."
Nan Zhubin introduced the rules to the audience like a magician demonstrating a new trick.
"This phone, in [normal mode], has a slow-motion function at 30 frames per second, which means in slow motion, it can capture changes on a person's face at the 1/30 of a second level. Such changes are sufficient for observing micro expressions."
Nan Zhubin's explanation was directed at the audience, but also at Lin Lulin.