Only the hills sent a faint echo back.

只有山丘传隐约回声。

These species use echolocation to find their way and identify food.

这类物种利用回声定位寻找方向和识别食物。

Like bats, they use echolocation to navigate.

和蝙蝠一样，它们也利用回声定位。

The returning echoes show where these objects are located.

返回回声能表明这些物体位置。

And the reverberation results from the vibrations that linger when the tissues pull apart.

而回声则源于组织分离时产生振动。

It's a book that resounds with reality.

这本书每一页都是冷酷现实回声。

Crystal Mountain, Washington, Echo Summit, California, Silver Lake, Colorado or Jay Peak, Vermont.

华盛顿水晶山、加利福尼亚州回声峰、科罗拉多州银湖还是佛蒙特州杰伊峰？

You can hear your own voice when you shout in the valley.

在山谷里，你大声喊就可以听到自已回声。

So was born the echo-sounding apparatus, now in general use in ships.

这样就产生了目前各种船舶上普遍应用回声探测仪。

The bat judges distances by a kind of echo-location.

蝙蝠用一种回声测定法判断距离。

Yeah, there's a lot of echo in the building actually for some reason.

对，不知道是什么原因，大楼里回声非常大。

So far, though, we've found no such cosmic echo.

但目前为止，我们还没发现这种宇宙回声。

I'm gonna tell you something and then you try interjecting with an echo question.

我要告诉你一些事情，然后你试着用回声问题插话。

To produce echoes that more accurately reflect the world.

用这种方法产生能更精确反应世界回声。

OCT is a form of optical echolocation.

OCT原理是光学回声定位。

Echoes of that disk live on today, seen in the flatness of the solar system.

这个碟状物回声甚至遗留到现在，只要看看太阳系扁平形状就知道了。

Even more amazing, bats navigate by echolocation which basically means they can see using sound.

更令人惊奇是，蝙蝠是通过回声定位，这基本上意味着它们可以用声音看到东西。

Exactly, the key is receiving the reflected echo of the sound.

没错，关键是接收到声音反射回声。

At this point, the zombies rely on echolocation after losing their sight.

在这一阶段，僵尸失去视力后依靠回声定位。

That glow is the echo of matter moving faster than light speed.

这种光是物质以比光速更快速度运动回声。