in a singsong

例句：

1. 1. She was singing a song in the car on her way home.
   她在回家的路上开车时唱着一首歌。
2. 2. The children were dancing in the park, singing songs they had learned at school.
   孩子们在公园里跳舞，唱着他们在学校学到的歌曲。
3. 3. After dinner, she sang a few lines from the movie she'd just watched.
   晚餐后，她唱了几段她刚刚看过的电影里的台词。