撞到桌子后,他膝盖上有个小肿块。

After hitting the table, he had a small bump on his knee.

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After hitting the table, he had a small bump on his knee.

bump 是名词,意思是"肿块、隆起物",指身体受到撞击后皮肤表面形成的肿胀部位。这个词也可以用来描述物体表面的突起部分。

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