board and board

例句：

1. 1. The teacher asked the students to board and board their homework.
   老师要求学生们反复做作业。
2. 2. The dancers were practicing board and board for the performance.
   舞者们为了表演反复练习舞蹈。
3. 3.The singer was board and board with her lyrics, trying to perfect her performance.
   歌手反复吟唱歌词，试图完美演绎。