Let Si indicate the cumulative number of workouts by day I. Since each day contains one workout, and the total number of workouts is 45, we know that.
设si表示第i天累计训练的次数，由于每天都有一个训练，单一项目总的训练次数是45次，我们得出。
Day after day and year after year, Zuo Si gradually grew up. Because of his unremitting afforts in hard study, he became an erudite scholar and wrote very excellent essays.
日复一日，年复一年，左思渐渐长大了，由于他坚持不懈地发奋读书，终于成为一位学识渊博的人，文章也写得非常好。
Although this policy oscillated during the implementation process, the content of Si-Shu was obvious day by day.
尽管这一政策在执行过程中有所反复，四书学的内容却逐渐得以凸显。
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