alternate exterior angles

例句：

1. 1. The team decided toalternate between two different strategies.
   团队决定交替使用两种不同的策略。
2. 2. They alternated betweenplaying basketball and soccer on the weekends.
   他们在周末交替进行篮球和足球运动。
3. 3.The teacher asked the students to alternate theirseats during the presentation.
   老师要求学生们在演讲时交替坐位。