In this case I will assume the cylinder is falling with the axis of the cylinder parallel to the ground (so the person would land on the back).

在这种情况下，我假设该圆柱是以柱轴跟地面平行的方式下落的(这样才能使人背部着地)。

youdao

As these crystals flutter to the ground, much time is spent with their faces flat, parallel to the ground.

这些冰晶缓缓地飘向地面，大多数时候是面向地面并与地面平行的。

youdao

In addition, the plane of the blades is parallel to the pole, so that a ground-hugging wind hits the blades face on.

此外，叶片平面同塔杆平行，从而使一股贴在地面的风吹打在叶片正面。

youdao

But before long those arms were perpendicular to the body and parallel to the ground as he celebrated his first strike in English football.

BBC: SPORT | Football | My Club | Fulham | Montella has lift-off at Fulham

As the pitch came in, he pulled the bat down, angled it parallel to the ground, and took a level swing a swing very different from the homer-seeking, flailing uppercut that has become standard among current players, who have produced the highest strikeout numbers in baseball history.

NEWYORKER: Artful Dodgers

To gain ground on Apple and Google, with their armies of mobile software developers, RIM is holding two parallel conferences this week.

FORBES: Research In Motion Not Ditching Keyboards, BlackBerry 10 Still A Work In Progress