We owe both the lever system in our jaws and small bones in our ear to our shark ancestors.
我们颚部的杠杆系统以及耳中的小骨链都拜鲨鱼祖先所赐。
The horse reared and I slid down his back to the ground, fracturing certain small bones.
这匹马后腿撑地立了起来，我滑下马背摔下来，几块小骨头因此骨折。
The horse reared and I slid down his back to the ground, fracturing certain small bones.
这匹马后腿撑地立了起来，我滑下马背摔下来，几块小骨头因此骨折。
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