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.
那地方清凉、安谧、幽静，今人陶醉，是个听回声的奇妙地方，是扰攘的市廛之外的一个避嚣良港。
It was a cool spot, staid but cheerful, a wonderful place for echoes, and a very harbour from the raging streets.
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.
结果甲状腺癌多数为单发（72.9%）、实质性（79.7%）、低和中等回声的（86.2%）甲状腺结节；
ResultsThe major sonographic appearance of thyroid carcinoma was single (72.9%), solid (79.7%), lowly or medially echoic (86.2%).
然而，多年的临床经验告诉我们，这种无回声的暗区，特别是局限性的暗区，常与邻近心脏其它脏器的疾病混淆。
However, experience has taught us that other types of sonolucent space adjacent to the heart can sometime be mistaken for pericardial effusions and loculated effusions in particular.
在船体外壳上敲打发出的声音会从海底反射。通过测量敲打与接受回声的间隔时间，这一点的海底深度就可计算出来。
A sound made by tapping on the hull of a shop will be reflected from the sea bottom, and depth of the sea at that point can be calculated.
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.
结论：B超对隐睾的位置、大小、内部回声的诊断确切，而且超声检查无损伤、无痛苦、简便、经济、可重复，可作为隐睾症的首选影像学检查方法。
Conclusions: For cryptorchism, B-ultrasonography is a simple, safe and effective, and repeatable diagnostic method, may be the image method of first choice.
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.
在风暴期间和之后，使用回声定位的鲸鱼基本上是在盲目游动。
During and after a storm, echolocating whales are essentially swimming blind.
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.
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.
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.
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