a sudden and unexpected event or piece of news
意外事件（或消息）
the job came like a bolt from the blue.
得到这份工作是出乎预料的事。
with the back very straight
笔直
she sat bolt upright in bed.
她笔直地坐在床上。
(informal)have done all that is in one's power
(非正式)竭尽全力
try to escape by moving suddenly towards (something)
试图迅速逃到（某处）
Ellie made a bolt for the door.
艾莉往门口逃去。
A sudden, shocking surprise or turn of events.
晴天霹雳：事件的突发或突然转变