蛇棋有哪些规则:请翻译英语短文

Not all sounds made by animals serve as language ,and we have only to turn to that extraordinary discovery of echo-location in which the voice plays a strictly utilitarian role .
并不是所有动物发出的声音都可以视作“语言”，我们只能寻求一种特殊的回声定位法，这时，声音具有绝对的实际作用。
To get a full appreciation of what this means we must turn first to some human inventions.
为充分理解这种方法，我们必须首先看一下人类的发明。
everyone knowns that if shouts in the vicinity of a wall or a mountain ,an echo will come back .
我们都知道，在一堵墙或一座大山附近（大声）喊叫，会有回声。
The further off this solid obstruction ,the longer time will elasp for the return of echo .
这种障碍物越厚实，回升持续的时间就越长。
A sound made by tapping on the hull of ship will be reflected from the sea bottom ,and by measuring the time interval between the taps and the reciept of the echoes,the depth of the sea at that point can be calculated.
通过敲打船体，声音会从海底返回；这样，通过测量敲打声和回音的间隔时间，就可以得知敲打处海洋的深度。
So was born the echo-sounding apparatus now in general use in ships.
这就是目前在船上普遍使用的回声设备的原理。
Every solid object will refect a sound, varying according to the size and nature of the object.
每种实心物体都会反射声音，并且根据物体的大小和性质而不同。
A shoal of fish will do this. So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.
一大群鱼也是这样，所以，根据海底位置来判断大群鱼的位置也就相对简单了。
With esperience, and with inproved apparatus,it is now possible not only locating a shoal but to tell if it is herring cool or other well-known fish, by the pattern of its echo.
根据经验以及先进的设备，现在不仅能判断鱼群的位置，还可以通过回声的种类来判断是青鱼还是其他著名鱼种。
It has been found that certain bats emit speak and by receiving the echoes,they can locate and steer clear of obstacles-or locate flying insects on which they feel.
人们还发现，有一种蝙蝠可以发出声音（说话），并通过接受回音来判断并导航障碍物的位置，或定位那些他们可以感觉到的飞行昆虫。
this echo-location in bats is often compared with rader,the principle of which is similar.
这种蝙蝠的回声定位功能经常与雷达向媲美，因为二者在原理上是相类似的。

去找个翻译网站吧，谁会有耐心看这么长的段落。