There are two kinds of assignments: Weekly exercises that are not to be handed in for grading but are intended to prepare students for the exams, and problem sets that are to be handed in and graded.
本课程准备了两种作业：不需缴交打分但可促使学生们为考试做准备的每周练习和需要缴交打分的作业题。
This post is the beginning of a series of self improvement exercises. Below is a list that I will be updating weekly until the self improvement exercises are complete.
本文是“自我提升”系列文章的第一篇，下面是我每星期的更新列表。
One group performed balance exercises on a computer-controlled platform once a week, one group took a weekly tai chi class, and a control group met for a weekly discussion.
一组每周在电脑控制的平台上进行一次平衡练习，一组每周上一次太极课，而另一受控组则每周进行一次讨论。
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