He was sitting on an upright chair beside his bed, reading.

他正坐在床边一把有靠背无扶手的椅子上阅读。

《柯林斯英汉双解大词典》

I was sitting on a wobbly plastic chair.

我当时正坐在一把摇摇晃晃的塑料椅子上。

《柯林斯英汉双解大词典》

Before she sitting on the chair, she took out some bumf and wiped the chair again and again.

在她坐下之前，她拿出一些卫生纸把座位擦了又擦。

youdao

I think even if you're in a chair, and you're sitting up straight with good posture, maybe hands on knees.

哪怕只是坐在椅子上，坐直并保持良好姿势，也许双手放在两膝上。

普林斯顿公开课 - 人性课程节选

Some one on his staff, sitting on a chair working over a map on a drawing board, growled at him in the language Robert Jordan did not understand.

NPR: Robert Jordan, Hemingway's Bipartisan Hero

Carla Devade is in her apartment, sitting on a chair in the kitchen, doing nothing.

NEWYORKER: Labyrinth

Here, sitting on an office chair, thousands of miles away from Darfur, the memories come flooding back.

CNN: Sudan soldier: 'They told me to kill, to rape children'