Definition
to abruptly start doing something
突然開始
She broke into song unexpectedly, surprising everyone.
她突然開始唱歌，讓每個人都感到驚訝。
In the meeting, he broke into a discussion about the next project.
在會議中，他突然開始討論下一個項目。
In the emergency, he broke into first aid without hesitation.
在緊急情況下，他毫不猶豫地開始進行急救。