unexpectedly [ˌʌnɪk'spektɪdlɪ]

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附加级

adv.未料到地，意外地；竟；居然；骤然

The volcano unexpectedly blew up early in the morning. 火山一早突然爆发了。
I had just put the dinner on when Jim walked in unexpectedly. 我刚把晚饭摆上桌，吉姆突然走进来。