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。

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，这种现象被称作气流上洗。

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。

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

它也更宽，尖倾斜，同时保留其基本结构和后掠角。

His wingtip shoes crunch on gravel.

他的尖鞋在砾石上嘎吱作响。

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？

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。

If the wingtips didn't fold, the jet would  have a wingspan equivalent to the Boeing 747 and the Airbus A380.

如果尖不折叠，喷气式飞机的展将相当于波音 747 和空客 A380。

It's 239 feet long, 79 feet tall and 262 feet wingtip to wingtip… orrrrrr, put simply, the length of two blue whales!

它长 239 英， 79 英， 尖到尖 262 英… … orrrrrr， 简而言之，两只蓝鲸的长度！

Simple Flying was able to get up close and personal with the 777X at the  2021 Dubai Airshow, including the new wingtips.

Simple Flying 能够在 2021 迪拜航展上近距离接触 777X，包括新尖。

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力，就像其他昆虫那样。

One of the unique features of the jet compared to other widebody commercial aircraft  is its folding wingtips.

与其他宽体商用飞机相比，这款喷气式飞机的独特之处之一是它的折叠尖。

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。

Of course, Boeing is well aware of this and  had built several safety mechanisms into the aircraft to stop it from taking off with the  wingtips still folded.

当然，波音公司很清楚这一点，并在飞机中内置了多种安全机制，以防止其在尖仍处于折叠状态时起飞。

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.

这个温柔的巨人受到了特殊的尊重，因为由于 A380 的四个发动机和尖产生的尾流湍流，其他飞机必须等待长达三分钟才能在 A380 之后开始起飞。