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1·I felt a sharp pain in my lower back.

我感到背的下部一阵剧痛。《柯林斯英汉双解大词典》

2·There are two main forms of lower back pain: acute and chronic.

下背部的疼痛发主要有两种类型：急性和慢性。

3·I had acupuncture in my lower back.

我在后腰上做了针灸。《柯林斯英汉双解大词典》

4·This exercise will work the muscles of the lower back.

这样的运动可以锻炼腰部的肌肉。《牛津词典》

5·Peek-a-boo (lower back): Lie face down on the floor using your outstretched arms to support baby in front of you.

躲猫猫（锻炼后腰）：脸朝下，用你伸展的胳膊支撑住你前面的婴儿。

6·Support the curve in your lower back.

后背的下半部分应有一定得曲线。

7·A surgeon's scar cuts across his lower back.

他的下背有一道手术疤痕。

8·Pain that radiates to your lower back and thighs

痛楚会延伸到下背和大腿处。

9·Maintain the natural curve in your lower back.

保持腰背部的自然弯曲。

10·Massage your shoulders, neck, head, lower back.

我喜欢按摩自己的双肩、脖子、头和后背。