Suddenly there was a loud bang.

突然发出砰的一声巨响。

《牛津词典》

Suddenly there was a loud bang and a puff of smoke.

突然一声巨响，喷出一股黑烟。

《牛津词典》

Suddenly there was a loud crack and glass flew into the car.

突然一阵巨大的爆裂声，碎玻璃飞溅进了车内。

《柯林斯英汉双解大词典》

Suddenly there is a terrible explosion.

VOA: special.2009.06.14

And once you hit puberty, suddenly there's huge variation in the abilities you have to learn language.

一旦你到了青春期,学习语言的能力会在突然间,发生巨大的变化

耶鲁公开课 - 心理学导论课程节选

And suddenly there are dozens and dozens of competing expressions of religious truth, and so you have a new proliferation of new religions and new religious ideas that comes about as the immediate product of the freedom of the press.

突然有许多许多,与之相对抗的宗教真理，所以我们有了迅速增多的新的宗教,和新的宗教观念,随着出版自由而产生的产物。

耶鲁公开课 - 弥尔顿课程节选

Suddenly there was a game on, and the teams traded attacks after the break.

BBC: Argentina 4-1 South Korea

Suddenly there is the glimpse of a looser monetary policy, of targets relaxed and of debt being mutualised.

BBC: Merkel relief at 'good day for Europe'

And, when that happens, in any public school in America, suddenly there's not a mirror to be found.

CNN: Give Obama A+ for school reform ideas