occurring or done quickly and unexpectedly or without warning
突然的;意外的;突然发生的
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a sudden bright flash. 一道突然的明亮闪光。
〈诗/ 文或非正式〉 突然地
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sudden there swooped an eagle downward 一只鹰突然猛扑下来。
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(all) of a sudden suddenly 突然地I feel really tired all of a sudden. 我突然间感到真的很累 -
on a sudden archaic way of sayingall of a sudden . 〈古〉 同all of a sudden .
"Middle English: from Anglo-Norman French