on the stupid, but every now and then,

上的愚蠢，但每當。

we get the chance to study at the feet,

我們有機會在腳下學習。

or in this case, the hands of a real expert.

或在這種情況下，真正的專家之手。

Meet Kevin from Switzerland.

認識一下來自瑞士的Kevin。

He's going to try and set a Guinness World Record title

他要嘗試創造金氏世界紀錄的頭銜。

for the fastest descent of 50 stairs

為最快下50級臺階

while walking on his hands.

一邊用手走路，一邊。

Good luck, Kevin.

祝你好運，凱文。

[music playing]

[音樂播放]

[cheering]

[歡呼聲]

Wow, 14.58 seconds.

哇，14.58秒。

I couldn't run it in that time.

我無法在那段時間裡運行它。

Don't forget, the problem with walking on your hands

別忘了，用手走路的問題。

is there's nothing to catch you when you fall,

當你摔倒的時候，沒有什麼可以抓住你。

and for most people, falling is almost inevitable

而對於大多數人來說，跌倒幾乎是必然的事情。

[thud]

[咕咚]

if you can get up in the first place.

如果你能在第一時間站起來。

Ah, that's much better.

啊，那就好多了。

[thumping]

[thumping]

Yeah, really well.

是啊，真的很好。

I would advise quite strongly that you don't try this.

我強烈建議你不要嘗試這個。

The thing is Kevin knew science, and when you know science,

問題是凱文懂科學，當你懂科學的時候。

it's just like a walk in the park, only

就像在公園裡散步一樣，只不過

upside down, on your hands, and not necessarily in a park.

顛來倒去，手忙腳亂，也不一定是在公園裡。

First, he swings his legs upwards,

首先，他把腿往上一擺。

generating just enough angular momentum

產生足夠的角動量

to stay balanced upside down.

以保持倒立平衡。

His arms must be strong enough to support his weight.

他的手臂必須有足夠的力量來支撐他的體重。

Being upside down can be disorienting as the vestibular

顛倒可能會使人迷失方向，因為前庭

system located in the inner ear sends signals

內耳系統

to the brain telling him he's inverted,

到大腦告訴他，他是倒置的。

meaning he must concentrate more to stay oriented.

意味著他必須更加集中精力來保持導向。

Going downstairs, he generates more angular momentum, which he

下樓後，他產生了更多的角動量，他。

balances out by going down quickly

急流勇退

and moving his arms, his base of support

並移動他的手臂，他的支持基礎

under his center of mass.

在他的質心下。