adj.突然的；出乎意料的
n.突发之事
His sudden death upset everybody. 他的突然去世使大家深感悲伤。
A sudden smile illuminated her face. 突然的微笑使她容光焕发。
He gave me a fright by bursting into a sudden laughter. 他突然大笑起来，吓了我一跳。
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。
His rise to power was very sudden. 他的掌权很令人意外。
用作名词 (n.)The boy began crying all of a sudden. 那男孩忽然哭了起来。
sudden的意思是“突然的,忽然的,迅速而意外的”,指事先没有预料到事情会发生,所以当事情发生时使人感到很意外。
all of a sudden的意思是“突然地,出乎意料地”,常用于口语中。也常用on a sudden,意思与all of a sudden相同,但不如all of a sudden正式或常见。
