Only the hills sent a faint echo back.

只有山丘传来的隐约的回声。

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

类物种利用回声定位来寻找方向和识别食物。

Like bats, they use echolocation to navigate.

和蝙蝠一，它们也利用回声定位来导航。

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

产生了目前各种船舶上普遍应用的回声探测仪。

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

而回声则来源于组织分离时产生的振动。

Did you never hear an echo? asked his mother.

“你难道从没听说过回声？”

It's a book that resounds with reality.

本书的每一页都是冷酷现实的回声。

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

华盛顿的水晶山、加利福尼亚州的回声峰、科罗拉多州的银湖还是佛蒙特州的杰伊峰？

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

在山谷里，你大声喊可以听到自已的回声。

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

蝙蝠用一种回声测定法来判断距离。

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.

用种方法来产生能更精确反应世界的回声。

OCT is a form of optical echolocation.

OCT的原理是光学回声定位。

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

个碟状物的回声甚至遗留到现在，只要看看太阳系的扁平形状知道了。

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

没错，关键是接收到声音的反射回声。

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

在一阶段，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.

种光是物质以比光速更快的速度运动的回声。

Many other types of animals that hunt in groups use vocalizations to keep connected.

许多集体捕猎的其它种类动物都利用回声定位来保持联系。