Ye Ziling was stunned for two seconds at the person who suddenly pushed the door in, and then nodded his head in a teacher's demeanor: "Just find a place to sit." ”

Then continue with the lecture.

During the undergraduate experiment week, the experimental classes are basically arranged when the students are free, and the teachers will discuss the time with the students, and concentrate on three or four days to finish all the courses. For this reason, classes before hands-on work are also arranged in the laboratory.

Of course, there are no fixed seats in the lab, and they are not as restrictive as in the classroom, so it is not uncommon for students to gather together.

All the curtains in the room were drawn, a projector was set up in the center, and the light curtain was on the white ......

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