bolt upright
adverb uk/ˌbəʊlt ˈʌp.raɪt/ us/ˌboʊlt ˈʌp.raɪt/
直立地
vertical and very straight
Suddenly she sat bolt upright as if something had startled her. 她突然直挺挺地坐了起来,好像受了惊吓似的。
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