He sat on the grass, his back resting against the tree.
他坐在草地上, 背靠着树。
靠背架；固定中心架
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knock out of, knock over, knock up against, knockability, knockabout, knockback, knockbal, knockdown, knock-down, knockdown-and-dragout,
相似单词
back of, back out, back out of, back plate, back porch, back rest, back room, back sb up, back street, back stroke,