Uphill and downhill should be done once.

上坡和下坡应当各做一次。

The paper regards the main roof strata in uphill and downhill mining of an inclined longwall as a elastic plate.

本文将倾斜长壁仰斜、俯斜开采的老顶岩层视为倾斜弹性板。

Participants should have basic cycling knowledge and ensure that they can control the bicycles properly during uphill and downhill.

参加者应懂得基本驾驶单车技术，能掌握上斜和落斜之技术。

The authors of the paper have investigated the use of a system that would see bumpers adjust to compensate for varying road conditions such as uphill and downhill stretches.

这篇论文的作者研究了这一系统的运用范畴，他们认为，保险杠是用来为各种复杂的道路状况如上坡路段和下坡路段来提供安全保障的。

Drivers go into the turn downhill and to the left before, moments later, turning it around to go uphill and to the right, often at insane velocities.

赛车先是经历一个下坡左转，过一会儿，又一个上坡右转，而且往往是在高速行驶途中。