20. break down / break up / break out / break into 坏了/ 驱散/ 爆发/ 破门而入 21. hold one's breath / out of breath 摒住呼吸/ 上气不接下气 22. bring about / bring up 引起,使发生/ 抚养长大 23. burst into tears / laughters 突然大哭/ 大笑 24. burst ou...