請先参考以下網頁的解釋及例句:
http://esl.about.com/library/glossary/bldef_a_11.htm
Definition: unexpectedly; by surprise
Explanation: Used when talking about something that happened that you didn't expect.
Examples: All of a sudden, he became extremely angry. - We were having a nice talk, when, all of a sudden, she began to cry.
all of a sudden點解呢?
這可解作: 意外地,突然間,怱然間,非期望地。
以上第一個例句可譯為:
突然間,他變得怒氣沖天。