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。

《柯林斯英汉双解大词典》

Helen sat upright in her chair.

海伦笔直地坐在椅子上。

《柯林斯英汉双解大词典》

She sat upright in bed.

她挺直地坐在床上。

《牛津词典》

Yes,you can see horns." These 500 to 1000-year-old cave paintings are young compared to the skeleton of Ardi, an upright hominid more than four million years old discovered in Ethiopia's Great Rift Valley .

VOA: standard.2009.12.14

There are two upright struts of the ladder, one shown in blue here, the other shown black.

两条上下的主链作为支柱,一条以蓝色表示,一条以黑色表示

耶鲁公开课 - 生物医学工程探索课程节选

One is that there are two backbones right here in the light blue, so this would be the upright parts of the ladder that are twisted.

其一是浅蓝色所代表的两条主链,这是构成,扭曲梯子的垂直部分

耶鲁公开课 - 生物医学工程探索课程节选

Sometimes when Magda comes out onto the steps and speaks, I sit bolt upright in bed.

NEWYORKER: Magda Mandela

But besides just being kind of weird, it requires, even at a minimum, sitting upright in bed.

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Andy sat upright in his chair with his hands folded in his lap.

CNN: November 19, 2012 -- Updated 1840 GMT (0240 HKT)