他站在那里，头向后仰，衬托在蓝天下。

He stood there, head back, framed against the blue sky.

《牛津词典》

弯曲颈部并刺激颈椎， 拉伸颈部， 头向后仰， 抬高下巴， 打开喉咙；

To arch the neck and stimulate the cervical spine, lengthen the neck, drop the head back, lift the chin, and open the throat;

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那页完成了一半的诗稿从膝上滑落下来，他头向后仰，嘴张着，正徜徉在梦河里碧草如茵的河岸。

His paper of half-finished verses slipped from his knee, his head fell back, his mouth opened, and he wandered by the verdant Banks of dream-rivers.

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