focus drum

例句：

1. 1. The music teacher used a focus drum to help the students focus on their lessons.
   音乐老师使用一个聚焦鼓帮助学生集中注意力学习。
2. 2.The children were fascinated by the sound of the focus drum.
   孩子们对聚焦鼓的声音感到非常着迷。
3. 3. The focus drum was used as a teaching tool during the performance.
   在表演中，聚焦鼓被用作教学工具。