He hid behind the back of a chair.

他躲在一张椅子后面。

youdao

He leant on the back of a chair, and covered his face.

他靠在一张椅背上，捂着脸。

youdao

Place the fingertips on a wall or the back of a chair for support.

双手放在墙上或椅背上支撑。

youdao

On the back of it, an iron bed and a chair and table were tied, and on top of them a crate of Barred Rock chickens."

车尾绑著一张铁床、椅子和桌子，上面还有一箱芦花鸡，“

耶鲁公开课 - 1945年后的美国小说课程节选

He saw a rag hanging on the back of a chair and used it to wipe his hands.

NPR: All Beings Are Interconnected

Or if Doc Brown had strapped a flux capacitor to the back of a comfy chair in Back to the Future (1985) instead of that iconic DeLorean?

FORBES: What If They Gave Oscars To The Best Car Movies?

There was a small popping sound and later, a crack appeared in the back of the chair.

WSJ: The Art of Designing Luxury Model Apartments