He had to spend all his time lying on his back.

他不得不整天躺着。

youdao

When the heat grew unbearable, he had retreated to an orchard, where, lying on his back in the long cool grass, he had traced the pattern of the apple-leaves diapered above him upon the summer sky.

当热得让人无法忍受时，他躲进果园里，仰面躺在清凉茂盛的草地上，在夏日的天空中描画着他头顶上的苹果树叶的形状。

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Her son was lying peacefully on his back.

她儿子正静静地仰面躺着。

《柯林斯英汉双解大词典》

When I look back now from this high hill of my old age, I can still see the dead lying all over the ground.

VOA: special.2010.04.08

She felt like lying back in the soft chair and enjoying the richness of it.

VOA: special.2009.09.05

He painted it while lying on his back.

VOA: special.2010.02.03

As a matter of perspective, we should remember this goes back to an alleged lying to a federal grand jury in December 2003.

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While it is possible Tommy told the truth back then and is lying now, such a scenario seems highly unlikely. (Why would Tommy start telling self-implicating lies after previously telling the truth?) More probably, Tommy was able to fool the polygraph.

CNN: Moxley Case: Excerpts from the Sutton Report

"We eventually found an elderly man lying on his back in a field, " he said.

BBC: Darlington teenager Laura Dean saves pensioner's life