When a surface is perpendicular to the rays, their intensity is at its maximum.

当表面与射线垂直时，射线的强度最大。

《新英汉大辞典》

The surface is perpendicular to gravity.

它们平面垂直于重力。

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And the force is perpendicular to the arm.

力是垂直于杆。

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The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.

第一个是在键轴之上和之下,我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。

麻省理工公开课 - 化学原理课程节选

This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.

BBC: Europe's Goce satellite probes Earth's gravity

At the Time of the initial Movement when the stone falls from the window its potential trajectory is one perpendicular Space that is no longer the same as the stone continues to move until it hits the ground.

FORBES: Colliding Galaxies Provide A Glimpse Into Our Future

The improved structure is based on perpendicular magnetization3 and takes element miniaturization to below 30nm.

ENGADGET: Toshiba goes perpendicular to solve MRAM's power issues, rethink cache memory