突然开始（做某事）：指突然开始做某事。
突然说出（某事）：指突然说出某事。
burst out // [ bursting bursts ]
动词词组 If someone bursts out laughing, crying, or making another noise, they suddenly start making that noise. You can also say that a noise bursts out. 突然爆发出
The class burst out laughing.
全班爆发出笑声。
Then the applause burst out.
随后爆发出掌声。
... break out爆发;突然发生 burst out突然说出;突然(哭、笑、叫)起来 cross one's mind突然想起;突然从脑海中掠过,想起来 ...
... Burst mode 突发模式 ; 成组方式 ; 猝发方式 ; 点放模式 Tone burst 猝发音 ; 短纯音 burst out 冒出 ; 突然起来 ; 猝发 ; 突然说出 ...
The class burst out laughing.
全班爆发出笑声。
Then the applause burst out.
随后爆发出掌声。
'For heavens' sake!' he burst out.
“天哪！”他大叫一声。
Sometimes,the melted rock comes out with a great burst of pressure.
VOA : special.2010.01.12
It's the guerdon, the reward, the prize of fame that we're continually anticipating will burst out someday in a sudden blaze of glory.
我们一直期盼的奖赏，回报，名望,某天会突然带着荣光到来。
弥尔顿课程节选 : 耶鲁公开课
because if you go out in public and you start talking to someone, you'll just burst into tears.
因为在外面的时候，你一开口跟人说话，眼泪就禁不住留下来。
SpeakingMax英语口语达人 : I feel like 课堂
The bankers all burst out laughing after hearing the signature line that earned Gooding an Oscar.
Moments later, Hayworth and some two hundred Republicans burst out of the meeting room.
Mr Major burst out laughing and agreed, after all, to give Kenny his interview.