break into song的用法和样例：
- Sometimes they speak, sometimes they break into song.
- She tickled the ivories and broke into song.
- The girl broke into song once more at the top of her voice.
- Korean businessman broke into song and hugged a policeman.
- Astronaut 2:Break into song?
- To break into a conversation. To break into song
- break into song 突然唱起来