alternate attacks of chill and fever

例句：

1. 1. The team alternated between playing offense and defense.
   队伍交替进行进攻和防守。
2. 2. They decided to alternate the roles of teacher and student.
   他们决定交替扮演老师和学生的角色。
3. 3. The schedule alternates between lectures and group discussions.
   日程表交替安排讲座和小组讨论。