translation.en: Now, for a period of three years, I gathered data, not just me but also some of my friends, and I used to teach in university, so I forced my -- I mean, I asked my students to do this as well.
translation.zh: 到现在我收集数据有三年时间了， 不仅我自己还有我的一些朋友。 我曾在大学教过书，所以我强迫- 我的意思是叫我的学生也帮我收集数据。