counting slide

例句：

1. 1. The teacher showed us a counting slide during the class.
   老师在课上给我们展示了一个计数幻灯片。
2. 2. She counted the numbers on the counting slide to make sure she got them right.
   她数了计数幻灯片上的数字，以确保自己算对了。
3. 3. The students used the counting slide to practice their addition skills.
   学生们使用计数幻灯片来练习他们的加法技能。