我哋就揀一個平常嘅工作日 按佢有 24 小時噉計 我哋揾咗三個嘅時間點 2007 年 ， 即係 10 年前 2015 年 同我上個星期啱收集咗數據嘅 2017 年
We chose a normal working day, and according to the 24 hours he had, we found three time points: 2007, which is 10 years ago, 2015, and 2017, when I just collected data last week