A second concave part is formed on the bottom surface of the base plate.

该基板的该底表面形成一第二凹陷部。

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A package with pins distributed over much or all of the bottom surface of the package.

一种封装，插脚分布在封装底部的大部分或全部表面。

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So, that means you have to figure out what's the bottom surface of your solid, and what's the top surface of your solid?

这意味着你必须指出,立体图形的底部的曲面，和立体图形的顶部曲面？

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The Swedish government is funding research into the feasibility of using a wind-turbine driven oxygen pump in the Baltic, following studies carried out last year by the University of Gothenburg, which looked at the effect of pumping oxygen-rich surface water to the bottom of two Swedish fjords.

CNN: Can oxygen pump breathe life into ocean 'dead zone?'

Most models set up to try to figure out what happened during the Late Cretaceous climate changes conclude that water sank from the surface to the bottom of the ocean around Antarctica or the North Pacific.

FORBES: Could Fish Fossils Help Us Better Predict Climate Change?

While the build quality of our review unit is generally top-notch, the bottom-left corner of that glass surface is not perfectly flush with the body.

ENGADGET: HTC 8X review: Windows Phone 8's compact flagship Mobile