• 1. bolt upright: 笔直地 | 笔笔挺直
• 2. sit bolt upright: 挺直地坐着
• 3. Stand Bolt Upright: 壁立

• 1.His face flushed scarlet and he sat bolt upright.
  他的脸涨得通红，笔直地坐着。
  dict.yoduao.com
• 2.When I pushed his door open, Trevor was sitting bolt upright in bed.
  我推开他的门时，发现特雷弗正笔直地坐在床上。
  dict.yoduao.com
• 3.The old woman sat down, bolt upright in the chair.
  老妇人在椅子上坐了下来，身子挺得笔直。
  dict.yoduao.com

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