Lastly, create winglets by folding down the top quarter-inch of the wingtips.

最后，通过折叠翅膀顶端的四分之一英寸来创建小。

Tracking its movement in minute detail, researchers found that the snail's wingtips trace out a figure of eight to generate lift, just like of those of an insect.

研究者仔细追踪这种海螺的运动，发现它的翅膀末端能伸出数字8那样的形状来产生支撑，就像其他昆虫那样。

The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.

鸟上方的气流在尖后方向上盘旋，这种现象称作气流上洗。

This gentle giant commands a special kind of respect since other airplanes have to wait up to three minutes before they can start their takeoff after an A380 due to the wake turbulence from its four engines and wingtips.

这款温和的巨无霸赢得了特别的尊重，因为其他飞机需要等待长达三分钟才能开始起飞，因为在空客A380的四台发动机和尖产生的尾流涡旋消散之前，它们不能安全起飞。

Carlisle revealed that it is possible to set  the wingtips to automatically retract once the aircraft drops below 50 knots while landing, with the folding process taking around 20 seconds.

卡莱尔透露，可以将尖设置为在飞机着陆时低于 50 节时自动缩回，折叠过程大约需要 20 秒。

The airbus wingtips will do something similar When unlocked in flight they will be capable of flapping freely up and down during gusts of wind or periods of turbulence.

空客的尖将会做类似的事情。在飞行中解锁后，它们将能够在阵风或湍流期间自由上下拍打。

So they parked all the planes like wingtip to wingtip, which just makes it easier to guard, but makes them easy to shoot up from the air too.

于是他们将所有飞机像机尖对机尖一样排列停放，这样虽然便于看守，但也使得它们在空中更击中。

The wingtip of the American Airlines Flight 5490 struck American Airlines Flight 4522 on a taxway at Ronald Reagan Washington National Airport around 1245 local time.

美国航空公司5490航班的尖在当地时间约12时45分撞上了罗纳德·里根华盛顿国家机场滑行道上的美国航空公司4522航班。

Typically, when you see these taxiway incursions, airplanes are taxing right next to each other and it's wingtip to wingtip damage.

通常情况下， 当你看到这些跑道入侵事件时，飞机正紧挨着滑行， 尖对尖， 极发生碰撞。

Two Argentine Skyhawk fighter jets slice through the South Atlantic sky, trails of white vapor tumbling from their wingtips.

两架阿根廷天空鹰战斗机划过南大西洋的天空，尖拖着白色的尾迹。

Their quiet dignity reminded me of my great-uncle Terry, who'd lived downstairs when I was growing up on Euclid Avenue, mowing our lawn dressed in wingtips and suspenders.

他们安静的尊严让我想起了我的叔叔特里，当我在欧几里得大道长大时，他就住在楼下，穿着尖和吊带修剪我们的草坪。

Seeing a feathered wingtip loosen and fall away, he realised the wax was softening in the heat.

看到羽毛翅膀的一端松动并脱落，他意识到蜡在高温下正在软化。

Their wingtips are black, and their under parts  are a whitish or tan colour with dark bands.

它们的尖是黑色的，下部呈白色或棕褐色，带有深色条纹。

What do you make of the Boeing 777X's folding wingtips?

您如何看待波音 777X 的折叠尖？

It is also wider with raked wingtips while retaining its basic structure and sweep.

它的尖也采用了后掠设计，从而使机变得更宽，同时保留了基本结构和后掠角度。

And then supposedly from watching buzzards and how their wingtips moved while they were in flight.

然后据说通过观察秃鹰以及它们飞行时尖的运动。

Because of big angle during landing, it may cause the wingtips or engines to hit the ground.

由于着陆时角度大， 可能会导致尖或发动机撞击地面。

His wingtip shoes crunch on gravel.

他的尖鞋在砾石上嘎吱作响。

The reason for the 777X's folding wingtips  is that they're a space-saving measure.

777X 折叠尖的原因是它们是一种节省空间的措施。

The plane won't automatically extend  the wingtips before take-off, though, with the task falling to the pilots.

不过，飞机不会在起飞前自动展开尖，任务落在了飞行员身上。