The third stage has a camera.  第三次发射，火箭上有一个摄像机。

We call it rocketcam.  我们称之为火箭摄像机。

And it's pointed at the hypersonic glider.  用于拍摄特超音速滑翔机。

This is the actual rocketcam footage from flight one.  这是一段来自首次飞行的真实录像。

Now to conceal the shape, we changed the aspect ratio a little bit.  我们稍稍改动了纵横比来遮掩滑翔机的样子。

But this is what it looks like from the third stage of the rocket looking at the unmanned glider as it heads into the atmosphere back towards Earth.  但这正是从火箭发射的第三阶段上看到的无人操纵滑翔机的样子。它冲进大气层返回地球。

We've flown twice.  我们飞了两次。

In the first flight,no aerodynamic control of the vehicle.  头一次没有对滑翔机操控。

But we collected more hypersonic flight data than in 30 years of ground-based testing combined.  但我们也收集了比过去30年间地面测试总和还多的数据。

And in the second flight,three minutes of fully-controlled,aerodynamic flight at Mach 20.  第二次飞行是历时3分钟的全程操控，空气动力飞行的速度是20马赫。

We must fly again, because amazing, never-been-done-before things require that you fly. 我们还要再飞一次。因为神奇的前人从未尝试过的事物促使我们飞行。

You can't learn to fly at Mach 20 unless you fly. 你飞不了20马赫，除非你继续飞。

And while there's no substitute for speed, maneuverability is a very close second.  虽然速度很重要，操纵性也同样不可忽视。

If a Mach 20 glider takes 11 minutes and 20 seconds to get from New York to Long Beach,a hummingbird would take,well, days.  如果20马赫的滑翔机花11分钟20秒。从纽约飞到长滩，那么，一只蜂鸟大概要几天。

You see, hummingbirds are not hypersonic, but they are maneuverable.  你知道，蜂鸟不是特超音速。但是操纵性很好。

In fact, the hummingbird is the only bird that can fly backwards.  事实上，蜂鸟是唯一能后退飞行的鸟。

It can fly up, down,forwards, backwards,even upside-down.  它能飞上飞下。向前飞，向后飞。甚至倒过来飞。

And so if we wanted to fly in this room or places where humans can't go, small enough and maneuverable enough we'd need an aircraft to do so.  所以，如果我们想在这个房间里或者人类无法到达的地方飞行。我们就需要飞机。体积小，操作性强方可达到此要求。

This is a hummingbird drone.  这是个蜂鸟无人驾驶飞机。

It can fly in all directions,even backwards.  它能向各个方向飞行。甚至向后飞。

It can hover and rotate.  它能悬停和旋转。

This prototype aircraft is equipped with a video camera.  这个原型机配有一个视频摄像头。

It weighs less than one AA battery.  它比一节AA电池还轻。

It does not eat nectar.  还不用吃花蜜。

In 2008,it flew for a whopping 20 seconds,a year later,two minutes,then six, eventually 11.  2008年它破天荒地飞了20秒。一年后是2分钟。然后是6分钟。最终飞了11分钟。

Many prototypes crashed many.  很多原型机都摔烂了—很多。

But there's no way to learn to fly like a hummingbird unless you fly. 但是无法学会象蜂鸟一样飞。除非不停地学习飞行。

It's beautiful, isn't it.Wow.  很美妙，是吧。哇。

It's great.  非常棒。