sudden可数。
adj. 突然的，意外的快速的
n. 突然发生的事
Their sudden attack made us more aware of the danger around us.他们突然的攻击使我们更加注意我们周围的危险。
He gave me a fright by bursting into a sudden laughter.他突然大笑起来，吓了我一跳。
She was dazzled by her suddensuccess.突然的成功使她感到迷惘。
I was struck by the sudden realization that I would probably never see her again.我突然意识到可能再也见不着她了。
The boy began crying all of a sudden.那男孩忽然哭了起来。
A sudden smile illuminated her face.突然的微笑使她容光焕发。
His sudden death upset everybody.他的突然去世使大家深感悲伤。
