It is crucial that the upper back and neck are held in an erect position to give support for the head.

重要的是：上背和颈部要挺直以支撑头部，这一点很重要。

《柯林斯英汉双解大词典》

For those who snore only when sleeping on their back, placing a pillow under their upper back may encourage them to change sleeping position.

对于那些仅在仰卧时才会打鼾的人，在他们的上背部放一个枕头可以促使他们改变睡姿。

youdao

Keep your upper back and neck comfortably straight.

保持后背上部和颈部舒适挺直。

youdao

And the fat that comes back reappears in a new area of the body, most noticeably the shoulders, arms and upper abdomen.

VOA: special.2011.07.05

You can see this region here is going to develop into one of the upper limbs, the arms here and the back is different from the front, the spinal cord is developing in the back, whereas, the structures that become our intestinal tract is developing on the other surface.

你能看到这个区域,将会发育成为上肢,这里是手臂,而且身体前后也有不同,脊椎正在后背发育,另外,会成为我们肠管的结构,也在另一个表面发育着

耶鲁公开课 - 生物医学工程探索课程节选

Pettitte has been out since May 17 with a strained muscle in his upper back.

WSJ: Buchholz, Red Sox beat Yankees 3-0 in 5?? innings

When the ends were efficiently tied, he laid his hand against my upper back.

NEWYORKER: Amundsen

The pain in my upper back reminded me that I was losing the fight.

WSJ: Book Excerpt: Confessions of a Surgeon