回声反射成欢欣。
这些特征应该被记录：大小、形状、回声反射性、边界、方位和衰减（例如：减弱或增强）。
These features should be noted: size, shape, echogenicity, margin features, orientation, and attenuation (eg, shadowing or enhancement).
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.
所以，树的回声会是一团混乱的声波反射，而不像飞蛾的回声那样。
So, the echoes from a tree are going to a mass of chaotic acoustic reflections, not like the echo from a moth.
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.
但是，橡树的叶子少而又大，反射力较强，会产生参差不齐的声波，或所谓的“粗糙回声”。
But an oak which has fewer but bigger leaves with stronger reflections, produces a jagged wave form, or what we called a rough echo.
这些（松针并不茂密的松树）能产生大量微弱的反射，我们称之为“平滑回声”。
Those produce a large number of faint reflections in what's called as: a smooth of echo.
他们发出尖叫声并根据反射的回声测量它们的环境。
They emit squeaks and gauge their environment based on the echo returned.
当利用它进行水下目标强度测试时，一个很实际的问题就是怎样区分声源直达声和目标反射回声，快速找出目标特性。
When we use it to test the underwater target strength, one problem is how to discriminate the direct sound of the source with the echo reflected from the target, finding the target character quickly.
这种回声现象是三层及以上各层塔墙和塔檐对声音反射的结果，而主要是各层塔檐结构所造成的。
The echoes are heard like the sound of frog. This is due to the sound reflected from the wall and eaves of the Pagoda, especially the structure of eaves.
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.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
除视觉外，蝙蝠还可以靠听觉飞行。它们可以发出声波，并接收从包括猎物在内的其他物体上所反射的回声。
Bats can navigate both visually and acoustically, by sending out sound waves and listening for echoes bouncing off objects-including prey.
这三种回声已经不是普通意义上的反射的声音，而是被赋予了特殊的寓意与使命。
Each one of the echoes mentioned above is not merely a reflected common sound here but is endowed with some special meaning or a certain function.
每遇到一个反射面时，回声在示波器的屏幕上显示出来，而两个界面的阻抗差值也决定了回声的振幅的高低。
Each encounters a reflective surface, the echo on the oscilloscope screen displayed the impedance difference between the two interfaces also determine the level of echo amplitude.
每遇到一个反射面时，回声在示波器的屏幕上显示出来，而两个界面的阻抗差值也决定了回声的振幅的高低。
Each encounters a reflective surface, the echo on the oscilloscope screen displayed the impedance difference between the two interfaces also determine the level of echo amplitude.
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