suddenly, abruptly
看到警察走来,他猛地跑了开去。
When he saw the police officer approaching, he suddenly ran off.
上次我在他面前猛地把门关上,把他扔在外面两天。
Last time, I slammed the door in his face and left him outside for two days.
— 八部半 (1963)
我猛地醒来,心里一下有了答案。
I woke up with a start, and suddenly I knew the answer.