每周运动锻炼(Weekly Exercises):基于所选的锻炼次数,你每周的锻炼时间将被划分成持续时间各不相
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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。
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