动词短语
中文翻译：Unknown
同义词：
['jump upright', 'straighten up', 'stand up straight']
例句：
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1. The soldier bolted upright as the enemy approached.
当敌人接近时，士兵突然挺直了身体。
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2.After the earthquake, everyone bolted upright and looked around for safety.
地震后，每个人都突然挺直身体，四处寻找安全的地方。
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3. The old man stood up straight and began to walk towards the door.
老人挺直身体，开始向门口走去。