大多数蝙蝠通过回声定位飞行。
座座山丘传来微弱的回声。
这个峡谷以回声而闻名。
他们分析回声，以及波是如何反弹回来的。
在我们的例子中，我们找到了真正的声学回声信标。
你找对思路了——真正重要的是所有树叶整体的回声。
You are on the right track—it is actually the echo of all the leaves as a whole that matters.
那女孩发出一声似乎是回声的咯咯笑声，然后跑开了。
The girl let out a giggle that seemed to echo, and she ran away.
微型蝙蝠利用视觉进行超出回声定位范围的长距离飞行。
Vision is used by micro bats to travel over long distances beyond the range of echolocation.
我们在山谷里大喊，不一会儿，回声就清晰地从山坡上传来。
We shouted in the valley, and in an instant, the echo came from the hillside with great distinctness.
回声定位是比较不解自明的；利用声波反射的回声来定位物体。
Echolocation is pretty self-explanatory; using echoes reflected by sound waves to locate things.
对于依赖回声定位系统导航的鲸鱼物种来说，这种海滩意味着灾难。
For whale species that depend on an echolocation system to navigate, this kind of beach spells disaster.
这些结构在早些年曾被回声探测器探测到，但是它们从未被钻探过。
These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.
这些声音在浅滩上逐渐消失，所以鲸鱼没有听到回声，就撞到了岸边。
These just fade out on shallow beaches, so the whale doesn't hear an echo and it crashes onto the shore.
有些种类的蝙蝠会根据回声频率的变化来调整向猎物移动的方向和速度。
Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.
所以蝙蝠发出这些脉冲，一种非常集中的声波，然后回声就会反弹回来。
So the bat sends out these pulses, very focused bursts of sound, and echoes bounce back.
通过在墙上悬挂吸音板，Sabine减少了足够的回声，使大厅可用。
By hanging panels of sound absorbing felt on the walls, Sabine reduced the echo enough to make the hall usable.
他发现，声音回声衰减的时间长短取决于周围物质对声音原始能量的吸收。
He found that the length of time it takes a sound's echo to decay is determined by the absorption of the sound's original energy by surrounding material.
他试过，但是在黑暗中，远处的回声听起来是那么可怕，所以他不再去试它了。
He tried it; but in the darkness the distant echoes sounded so hideously that he tried it no more.
在这个传递和反射的过程中，声音发生了变化，回声的变化使蝙蝠能够感知到目标的特征。
In this process of transmission and reflection, the sounds are changed, and the changes in the echoes enable the bat to perceive features of the target.
通常，当它们游泳时，会发出咔嚓的声音，所产生的声波会在回声中被反射回到它们身边。
Usually, as they swim, they make clicking noises, and the resulting sound waves are reflected in an echo and travel back to them.
在靠近中心的地方，她的回声受到了其他声音的干扰；看到谷仓，她猜想这是牧师的声音。
Nearing the central part, her echoes were intruded on by other sounds; and seeing the barn, she guessed these to be the utterances of the preacher.
例如，他们很快就能识别出与飞蛾有关的回声，飞蛾是蝙蝠的常见猎物，尤其是扑打翅膀的飞蛾。
For example, one echo they quickly identify is the one they associate with a moth, which is common prey for a bat, particularly a moth beating its wings.
他收集的数据得出了一个关于房间回声持续时间、吸音材料的数量和质量以及空间体积之间关系的数学公式。
The data he compiled yielded a mathematical formula for the relationship between a room's echo duration, its quantity and quality of sound-absorbing materials, and its spatial volume.
甚至还没有意识到这个事实的盲人，实际上是在利用他们自己的脚步声和其他声音的回声来感知障碍物的存在。
Blind people, without even being aware of the fact, are actually using echoes of their own footsteps and of other sounds, to sense the presence of obstacles.
事实上，有一些品种的蝙蝠不使用回声定位，而是依靠视觉来导航，但对很多蝙蝠来说，它们的视觉太弱了，确实不能依靠。
Actually, there are some species of bats, the ones that don't use echolocation that do rely on their vision for navigation, but it is true that for many bats, their vision is too weak to count on.
他认识到自己所犯的错误并想挽回声誉。
He realized the mistake he had made and wanted to redeem himself.
史密斯先生急忙试图收回声明，但它刚刚已经在国家电台播出了。
Mr. Smith hurriedly sought to retract the statement, but it had just been broadcast on national radio.
古琴的声音与山间的回声交织在一起，直到音乐家感到自己与自然融为一体。
The sound of the guqin mixed with the echoes from the mountains, until the musician felt he was at one with nature.
大叔立刻大声吹起了口哨，声音很响亮，从四处传来了回声。
The uncle immediately whistled so loud that it resounded from all sides.
回声现象就是在房间中，声源停止发声后，声音仍然持续的现象。
Reverberation is the persistence of sound in a room after the source has stopped making sound.
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