suddenly /ˈsʌdn̩li/ adverb Learner's definition of SUDDENLY
: very quickly in usually an unexpected way : in a sudden way突然地;忽然地;出乎意料地 -
Suddenly the lights went out.灯突然灭了。
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I was suddenly very nervous.我忽然非常紧张。
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There were no instances of the disease here until it suddenly appeared last year.这儿原先没有这种病例,直到去年才突然出现。
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She suddenly decided to quit her job.她突然决定辞职。
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He died suddenly of a heart attack.他死于心脏病突发。