Tian Tian didn't sleep well last night. She had been feeling sleepy during class this morning. She swayed left and right, like a sleepless cat.
Li Li thought she was cute, so she secretly took out her phone to take a photo of Tian Tian. Suddenly, a loud explosion woke up all the sleepy students, and the teaching building shook a few times.
Another explosion followed, louder than the first.
"What happened?" The students panicked. "Is it an earthquake?"
The old professor on the podium quickly asked the students to squat under the table. If there was really an earthquake, they would not be able to escape.
After a few minutes, the old professor saw that there were no more explosions, so he quickly evacuated the students to the square outside to prevent another accident.
