These vessels entered the cortex perpendicularly to the cortical surface.

这些血管都垂直于小脑皮质的表面进入皮质。

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Why should that apple always descend perpendicularly to the ground, thought he to himself.

为什么苹果总会垂直地落在地上，他心中想到。

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A type of surface wave in which particles oscillate horizontally and perpendicularly to the direction of wave propagation.

一种面波，质点水平地振动，并垂直于波传播的方向。

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"We're finding that when you rub a natural biological surface that has an orientation - that has a grain, if you will - and you run that grain perpendicularly to the long axis of the ridges, we find a dramatic increase in friction, " Dr Dominy told BBC News.

BBC: Artificial finger tests evolutionary origin of prints

"We want to get the lead inside, so instead of chopping the pencil up perpendicularly and exposing just the ends, we strip the wood casing off the outside and expose the length of the lead, " says Litzen.

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