sudden/'sʌdən/

a. done or happening quickly and unexpectedly

a. 突然的：We are surprised by the sudden death of his father. 我们对他父亲的突然去世感到吃惊。

all of sudden 突然：All of sudden, I saw him running towards me. 我突然看见他朝我跑来。

音组-den/-dən/

burden; garden; golden; sudden; wooden