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1·While walking, I noticed a pony roll over on his back.

我走过去时发现一只小马驹在他背上打滚。

2·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》

3·He had lacerations on his back and thighs.

他的背部和大腿都有划伤。《柯林斯英汉双解大词典》

4·He could feel the heat of the sun on his back.

他能感觉到太阳照射在背上的热度。《牛津词典》

5·He then keeled over and fell flat on his back.

然后他就倒下了，仰面朝天。《柯林斯英汉双解大词典》

6·He continued to lie on his back and look at clouds.

他继续仰面朝天躺着，看着云彩。《柯林斯英汉双解大词典》

7·The clothing on his back got burnt away in the fire.

他的衣服后背在大火中烧掉了。《牛津词典》

8·The baby lay on his back with his eyes closed tight.

这个婴儿平躺着，两眼紧闭。《柯林斯英汉双解大词典》

9·Dad carried me on his back.

爸爸把我放在他的背上。

10·There are some spots on his back.

他背上有许多斑点。