Sometimes the craft is heavier than air, and sometimes lighter.

有时比空气重, 有时轻。

The MAV, that was only designed to get to low Mars orbit.

能够抵达火星低轨。

This is the moment when it touched down.

这就是降落时刻。

But the tiny flyer was tough to control.

但这种小小很难控制。

China launched a new spacecraft to the moon.

中国再次向月球射。

Is the probe going to be ready on time?

能按时准备好吗？

The orbiter is still doing its job circling the moon.

轨道仍在绕月。

To fly an aircraft that's completely silent, makes no sound.

我们一点声音也没有。

Now there's one problem with robots like this.

这些有一些缺点。

Majestic flying machines fill the sky.

壮观布满天空。

But they were not preparing to fly an aircraft.

但他们并没有准备好驾驶。

But ISIS doesn't even have an air force or any kind of aircraft.

但是ISIS甚至都没有空军或。

It's got a tiny piece of the Wright Flyer aboard.

上面有一小块莱特碎片。

So this is really a gargantuan vehicle.

所以这个真非常庞大。

And the vehicle performed very well.

这个表现得非常好。

Getting on board, you are going into a spacious cabin.

登上后，可以看到舱内十分宽敞。

NASA calls it the U.S. Deorbit Vehicle (USDV).

美国宇航局称之为美国脱轨。

A race of red men who travel our world in flying machines.

一个乘坐路过我们这里红色种族。

And here there's a single person able to lead this network of followers.

所以这个实验员能够导这一群。

The spacecraft is going to make a loop around the moon before returning to Earth.

该将在绕月后返回地球。