suddenly 是 sudden的派生词
词义参考：
sudden
英 [ ˈsʌdn ] 美 [ ˈsʌdn ]
adj.
突然的，未预见到的; 急躁的，仓促的; 快的，迅速的; 急剧
例句
1.
"I think I'll try a hypnotist," I said with sudden resolution.
“我会找催眠师试试，”我突然坚决地说。
2.
He felt a sudden sense of calm, of contentment.
他突然感到一种安宁和满足.
3.
The sudden onset of winter caused havoc with rail and air transport.
冬天的突然降临让铁路和航空运输系统陷入混乱。
