1.	His wife's sudden death upset the balance ofhis mind.
	他妻子突然去世,他感到六神无主。
2.	I was caught off balance by the sudden wind and nearly fell.
	突然一阵风吹得我东摇西晃险些摔倒。
3.	She was agitated by his sudden appearance at the party.
	他在聚会中突然出现,使她心烦意乱。
4.	The sudden appearance of a policeman caused the thief to run away.
	警察突然出现,小偷就逃跑了。
5.	The children were surprised by the sudden entry of their teacher.
	老师突然进来把孩子们吓了一跳。
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all of a sudden   突然