Only the hills sent a faint echo back.

只有传来的隐约的声。

The returning echoes show where these objects are located.

返的声能表明这些物体的位置。

The lake echoed with the sound.

湖上荡起了声。

OCT is a form of optical echolocation.

OCT的原理是光学声定位。

That, my son, is an echo.

孩子，这就是声。

Did you never hear an echo? asked his mother.

“你难道从没听说过声？”

It's a book that resounds with reality.

这本书的页都是冷酷现实的声。

Think of it like echolocation with a melody.

把它想象成带有旋律的声定位。

You walk in and it's big, and there's a echo.

你走进去，里面很大，有声。

Like bats, they use echolocation to navigate.

和蝙蝠样，它们也利用声定位来导航。

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

而声则来源于组织分离时产生的振动。

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

蝙蝠用声测定法来判断距离。

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

没错，关键是接收到声音的反射声。

Bellatrix hit him across the face: the blow echoed around the room.

房间四周立刻响起了声。

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

这光是物质以比光速更快的速度运动的声。

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

在这阶段，僵尸失去视力后依靠声定位。

(Echoes) And at the bottom of that cave is an X marks the spot.

（声）洞穴的底部有个标记地点的大叉。

In what way does echo-location in bats play an utilitarian role?

蝙蝠⽤声定位扮演着什么样的⻆⾊？

Its voice was distant and echoing.

他的声音很遥远，带着声。

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

在谷里，你大声喊就可以听到自已的声。