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翼。

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

鸟翼上方的气流在翼尖后方向上盘旋，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 折叠翼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，翼尖倾斜，同时保留其基本结构和后掠角。

His wingtip shoes crunch on gravel.

他的翼尖鞋在砾石上嘎吱作响。

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

您如何看待波音 777X 的折叠翼尖？

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

它们的翼尖是黑色的，下部呈白色或棕褐色，带有深色条纹。

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翼尖，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.

如果翼尖不折叠，喷气式飞机的翼展将相当于波音 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， 翼尖到翼尖 262 英尺… … orrrrrr， 简而言之，两只蓝鲸的长度！