I read the book in one sitting.

我坐下来一口气就把那本书看完了。

《牛津词典》

She would eat four tubs of ice cream in one sitting.

她会一口气吃下4杯冰淇淋。

《柯林斯英汉双解大词典》

Kelly can sit for hours without moving, and often gets all her homework done in one sitting.

凯利可以坐好几个小时不动，经常坐下一次就完成了所有的作业。

youdao

One description said it was like sitting in the driver's seat of a small car, while wearing two heavy raincoats.

VOA: special.2009.06.17

And also, as I'll discuss in a minute, a lot of people don't recognize what a portion is, and because the food industry has been very successful at recalibrating us to think about what's acceptable to eat in one sitting at one time, and because of that our notions of portions have been thrown way off.

同时,马上我要讲到,很多人不知道摄入量是什么,因为食品业,成功的重塑了我们,就坐用餐时关于什么东西是可食用的看法,而这使我们对摄入量这个概念,有了不同看法

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

He writes down this four- to five-minute composition note for note in just one sitting.

他便一口气,逐个音符地,写下了这段四到五分钟的作品

耶鲁公开课 - 聆听音乐课程节选

It is possible to eat three of them in one sitting without suffering any ill effects.

FORBES: Krispy Kreme, Famously Touted by Nora Ephron, Seems Ever-Overvalued

My recommendation: Don't try to read The Art of the Start in one sitting.

FORBES: Two for Our Time

He could walk for two days without eating, or eat three meals in one sitting and then be off.

NEWYORKER: Bear Meat