The Mega Lion has five retractable claws on each foot.

拟狮每只脚上有五个缩的爪子。

The lion has retractable claws, and so they can protect those while they're just running.

这种狮子有缩的爪子，所以它们在跑动时能保护那些爪子。

Equipped with 20 retractable claws, and a mouthful of bone crushing teeth, they were major predators.

有了二十个缩的爪子，加上满口能咬碎骨头的牙齿，它们是主要掠食者。

" What was that about? " whispered Ron, reeling in the Extendable Ears.

“这到底是怎么回事？”罗恩小声问，一边把缩耳的细绳收了回来。

The longer the bridge is to start with, the more it will expand or contract.

它是缩的。

The first is 6 meters in length with retractable wings.

第一个 6 米，带有缩的机翼。

So we know Velociraptor had retractable claws.

所以我们知道迅猛龙有缩的爪子。

What lineage gave rise to these weird reptiles with beaks for mouths and retractable necks?

是什么血统产生了这些奇怪的爬行动物，嘴巴是喙，脖子是缩的？

Because, just like cats, they had fully retractable claws, a trait that canids eventually lost.

因为，就像猫一样，它们有完全缩的爪子，犬科动物最终失去了这一特征。

The current president now uses a shorter set of retractable stairs for Air Force One.

现任总统现在空军一号使用了一套更短的缩楼梯。

The entry is via the aft air stairs, which were retractable and are retracted whenever I leave for an extended time.

入口就是尾部的空气楼梯，它是缩的，当我离开一段时间后它就会自动收回。

Let's not forget our beloved retractable click pens and their dainty, clicky sounds.

让我们不要忘记我们心爱的缩点击笔和它们精致的滴答声。

And I've designed and created the most realistic, expandable extendable lightsaber.

我设计并制作出了最逼真的、具有延展性的缩光剑。

But which of these living animals have retractable claws as well?

但是这些活生生的动物中有哪些也有缩的爪子呢？

And perhaps Dromaeosaur like Velociraptor used their retractable claws to hang on to prey as wall.

也许像迅猛龙这样的驰龙使用它们缩的爪子将猎物挂在墙上。

A colossal retractable roof will cool the interior, helping to manage the scorching Qatari temperatures.

其巨大的缩屋顶将为室内降温，有助于控制卡塔尔的高温天气。

But we do know that they had retractable claws and  were likely great climbers, like most modern cats.

但我们确实知道它们有缩的爪子，并且能是出色的攀爬者，就像大多数现代猫科动物一样。

It's not like, " Gonna need the expandable waistband if you ate the plate of nachos." HEATHER: Right.

这不像是“如果你吃了一盘玉米片，就需要缩的腰带”。希瑟：对。

Small ailerons, a conventional tail for steering and a retractable landing gear with two wheels.

小型副翼、用于转向的传统尾翼和带两个轮子的缩起落架。

Combining these two advances, researchers at the Massachusetts Institute of Technology created a stretchy polymer with stiffness similar to human soft tissues.

有着这两项进步，麻省理工学院的研究人员 创造出一种缩的聚合物，其硬度和人体的软组织相似。