第4级学习进度：1/766
a sudden attack  1
突然袭击
参考例句
1.It was supposed that he had had a sudden attack of faintness.据估计，他当时突然头晕发作。
2.A sudden attack of typhoid cut him off in the prime of his life.伤寒突然发作使他年纪轻轻就被夺去了生命。
   
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