他们将彼此背在背上。
他把他的瘸子同伴背在背上，然后他们安全又愉快地继续上路了。
He took his lame companion upon his back, and they traveled on with safety and pleasure.
当天气炎热时，鸵鸟会把它们背在背上，这样就增加了太阳辐射与皮肤之间的屏障厚度。
When conditions are hot, the ostrich erects them on its back, thus increasing the thickness of the barrier between solar radiation and the skin.
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