City C, Tsinghua University School of Medicine.
It was approaching late at night, and there were still a few lights on in the building. There was a sound of footsteps gradually in the originally empty corridor, and the two girls whispered to each other: "...Let's go, I'm exhausted. I have to write a report when I get back."
"Okay, then I'll go change my clothes."
Another person paused mid-sentence: "Hey--is that the central air conditioner of our medical department?" The kind that refrigeration is used for.
The two of them slowed down as they spoke, and glanced through the window as if unintentionally. I dare not make a sound for fear of disturbing the people in the laboratory.
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