I used to see people reading papers on the train to college.
When I was still a student at that time, I imagined the reason why I was reading the thesis, saying, "It's time for graduation thesis" or "Maybe the seminar presentation is near" when I found them.
I thought, "You don't have to read anything on the train."
For me at that time, reading a thesis was a study.
When I see a high school student studying on the train, I feel like it's hard.
But now I feel like I understand their feelings.
While reading the thesis on the train, the feelings of the people who were once in a while grinning.