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

最后，通过折叠翅膀顶端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.

鸟上方气流后方向上盘旋，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 折叠原因是它们是一种节省空间措施。

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

它也更宽，倾斜，同时保留其基本结构和后掠角。

His wingtip shoes crunch on gravel.

他鞋砾石上嘎吱作响。

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

它们是黑色，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 折叠？

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

不过，飞机不会起飞前自动展开，任了飞行员身上。

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

如果不折叠，喷气式飞机展将相当于波音 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 英尺， 高 79 英尺， 到 262 英尺… … orrrrrr， 简而言之，两只蓝鲸长度！

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 2021 年迪拜航展上近距离接触 777X，包括新。

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运动，发现它翅膀末端能伸出数字8那样形状来产生支撑力，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，这款喷气式飞机独特之处之一是它折叠。

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，可以将设置为飞机着陆时低于 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，并飞机中内置了多种安全机制，以防止其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.

这个温柔巨人受到了特殊尊重，因为由于 A380 四个发动机和产生尾流湍流，其他飞机必须等待长达三分钟才能 A380 之后开始起飞。