" The elephants then stop eating and become too weak to keep their heavy frames upright, " he added.

" 大象会停止进食，身体变得虚弱，无法支撑它们沉重的身躯。"

The aim of the game is to keep the hoop upright for long periods of time, or to do various tricks.

游戏目的是让铁环长时间滚动，或者做各种杂耍动作。

Do whatever it takes to keep my body upright.

尽一切努力保持我的身体直立。

To understand how that works in practice we need to look at how some of our oldest and tallest skyscrapers are being kept upright today.

要了解这在实践中是如何发挥作用的，我们需要看看我们最古老、最高的一些摩天大楼如今是如何保持直立的。

These let the whole thing roll smoothly along, keeping the luggage compartment upright, at up to 35kph (22mph).

这种设计可以让机器人在保持整个货舱直立的同时平稳地向前滚动，时速可高达每小时35公里。

Partly this is because gravity on earth naturally keeps human beings' bones and muscles in good condition as they are constantly working to keep us upright.

部分原因是地球上的重力使人类的骨骼和肌肉自然而然地保持良好状态，因为它们一直在努力使我们保持直立状态。

The rest of the stem is filled with ground tissue — those big, juicy parenchyma cells, which help keep the plant upright and store water and nutrients.

茎的其余部分充满了基本组织——那些大而多汁的薄壁细胞，它们有助于保持植物直立并储存水分和营养。

Of course, the Empire State wasn't just left to erode into dust and over its lifespan it has undergone many different retrofits and operations to keep it upright.

当然，帝国大厦并没有任由其被侵蚀成灰尘，在其生命周期中，它经历了许多不同的改造和操作，以保持其直立性。

Just the spine itself, which is made up of 24 small bones called vertebrae, is necessary if you want to keep yourself upright or even stand at all.

如果您想保持直立甚至完全站立，仅由 24 块称为椎骨的小骨头组成的脊柱本身就是必需的。

It's said that during extended missions, astronauts' calluses vanish from the base of their feet but reappear on the top, because this is suddenly a very crucial body part for keeping them upright and steady.

据说，在长时间的飞行任务中，宇航员脚底的老茧会消失，但脚面的老茧会重新出现，因为脚面是能让他们保持直立和稳定的非常关键的一处身体部位。

You know, the strange thing about having a wobbly seat is that you spend so much time trying to keep it upright that you can never bring your full self to the table.

你知道，摇摇晃晃的座位的奇怪之处在于你花了太多时间试图让它保持直立，以至于你永远无法将完整的自我带到桌子上。

And then this drag chute opens up, as it's coming out of the plane and the only purpose for this drag chute is to keep the sonde upright and falling at a correct amount,2,500 feet per minute -- per minute.

接着，这个降落伞就打开了，当它从飞机上出来时，这个拖曳滑槽是为了保持探空仪能直立并以2500英尺/分钟的适合速度下降。

I was dreadfully frightened, and so giddy that I clung to him with both hands, and said, " If you would kindly please to let me keep upright, sir, perhaps I shouldn't be sick, and perhaps I could attend more" .

我吓坏了，头晕目眩，用双手紧紧抓住他，说：" 先生，如果你能让我保持直立，也许我不应该生病，也许我可以参加更多。