拍子记号

例句：

1. 1. The dancers performed a beautiful ballet at the festival.
   舞者们在节日上表演了一场美丽的芭蕾舞。
2. 2. The teacher gave us a lesson on how to play the piano correctly.
   老师教我们如何正确地弹钢琴。
3. 3. In tennis, each player has a set of rules to follow during the game.
   在网球比赛中，每位选手都有一套规则来遵循。