啄木鸟在它们的大脑和头骨之间几乎没有“次硬脑膜空间”，所以其大脑不像人类的一样在四周有凹凸不平。

The birds have little "sub-dural space" between their brains and their skulls, so the brain does not have room to bump around as it does in humans.

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其布面凹凸不平，有轻微的按摩作用。

Oil on its rugged surface, a slight massage effect.

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比较两个左和右轮胎，如果一方比另一方，你有凹凸不平的踏穿哪件很可能是造成较大。

Compare both the left and right tyres, and if one side is higher than the other, you have uneven tread wear which is most probably caused by misalignment.

youdao

比较两个左和右轮胎，如果一方比另一方，你有凹凸不平的踏穿哪件很可能是造成较大。

Compare both the left and right tyres, and if one side is higher than the other, you have uneven tread wear which is most probably caused by misalignment.

youdao