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.
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.
记录显示蝙蝠发出的回声的复杂性，每次发声仅仅持续四分之一毫秒。
The recordings revealed the complexity of the sounds that some bats emit, with each click lasting only a quarter of a millisecond.
然后他们又对这些受试者播放了回声的录音，并研究了受试者的大脑活动。
Then they studied the subjects' brain activity while they played back the recordings.
结果NTHI明显增加心腔内自发性造影回声的检出率及云雾密度与亮度。
Results NTHI could obviously increase discover rate of spontaneous echo-contrast, density and brightness of smoke-like echo.
回声的两国人民之间的友谊中可以看到的特点菲尔丁和阿齐兹的印度之行。
Echoes of the friendship between the two can be seen in the characters of Fielding and Aziz in a Passage to India.
通过所有的骚动和冲突我听说它是响音乐，它发出一在我的精神中回声的信号。
Through all the tumult and the strife I hear it's music ringing, it sounds an echo in my soul.
该系统采用了减噪和降低回声的技术，因此通话质量十分清晰。当有电话打进时，将自动暂停正在播放的歌曲。
Thanks to noise-cancelling and echo-reducing technology, call quality is sharp and clear, and it will automatically pause whatever music you’re listening to when a call comes in .
那里有清澈的天空和最少的人类活动，因而作为观察大爆炸之后最早期传来的微弱回声的地点很理想。
The region has clear skies and minimalhuman activity making it ideal for observing faint echoes from the earliest days of the universesoon after the Big Bang.
而科学家研究发现，在这些人的大脑中，处理回声的部分并不是掌管听力的部分，而是大脑的视觉皮质。
And now scientists have learned that the area of the brain that processes the echoes is not the region for hearing-it's actually the visual cortex.
不仅有可能测定鱼群的位置，而且可以根据鱼群回声的图象区分出鲱鱼，鳕鱼或其他人们所熟悉的鱼。
It is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
根据经验和改进了的仪器，人们不仅能确定鱼群的位置，还可以根据鱼群回声的特点辨别鲱鱼、鳕鱼还是其他人们熟知的鱼种。
With experience, and with improved apparatus, it is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
座座山丘传来微弱的回声。
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.
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.
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.
他们分析回声，以及波是如何反弹回来的。
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.
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.
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.
总之，就像我刚才讲的，通过分析这些回声，蝙蝠可以确定，比如说，洞穴里是否有需要避开的墙壁，以及它的距离有多远。
Anyway, as I were saying, by analyzing these echoes, the bat can determine, say, if there is wall in a cave that it needs to avoid, and how far away it is.
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.
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.
这些蝙蝠能够区分这两种声音，不仅仅是通过树木的回声，而是通过任何平滑或粗糙的回声。
These bats can distinguish between the two, and not just with trees, but with any echo that comes in a smooth or rough shape.
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.
事实上，我们推断蝙蝠在分析回声时过滤掉了很多因素，就像一个复杂的雷达系统可以忽略地面上静止物体的回声那样。
In fact, we kind of assumed that they were filtering a lot out, the way a sophisticated radar system can ignore echoes from stationary objects on the ground.
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.
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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