蝙蝠用一种回声测定法来判断距离。
蝙蝠凭回声测定方向。
不过，对测定目标物距离来说，声波运行的速度太慢，因此，声波回声测距法在实用中有其局限性。
Thus this soundwave echo method has its limitation in practical use.
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.
这有点像大叫之后测定回声，然后根据听到多少回声来估计叫得有多大声。
This is sort of like having someone yell, counting the echos, and then estimating how loud they yelled from how many echos you could hear.
结论可通过脑回声平均灰度值测定，作为临床评价新生儿脑发育的指标，以减少因人为因素导致分析的主观性。
Conclusion the brain development in infants can be evaluated with the average values of gray density by echoencephalography and medical image analysis system.
结论可通过脑回声平均灰度值测定，作为临床评价新生儿脑发育的指标，以减少因人为因素导致分析的主观性。
Conclusion the brain development in infants can be evaluated with the average values of gray density by echoencephalography and medical image analysis system.
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