Off-screen voiceover (all characters have their mouths closed, no one is speaking on screen): Voice: 低沉沙哑，带有烟草熏过的质感，语速缓慢且冷静，充满虚无主义的冷酷感，中年男性。. Narrator: "疲劳值百分之八十，是大脑发出的警告；心率每分钟一百一十次，在寂静车厢里如同闷鼓。" No background music.
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