translation.en: Now, the class ran 10 weeks, and in the end, about half of the 160,000 students watched at least one video each week, and over 20,000 finished all the homework, putting in 50 to 100 hours.
translation.zh: 到目前为止，这个课程已经进行了10周了, 最后，一万六个学生中的一半都会 至少在每周看一个视频 而且超过两万人完成了他们的作业 投入了50-100个小时