有些种类的蝙蝠会根据回声频率的变化来调整向猎物移动的方向和速度。
Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.
本文分析了112例肝包虫患者的超声图像资料，根据回声特征可分为囊性型、混合型和实质型三类。
The ultrasonographic data of 112 cases with liver hydatid disease are analysed. On the basis of characteristic echoes, hydatid cysts are divided into three types, cystic, mixed and solid.
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.
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.
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.
根据斑块声像性质将研究对象分为无斑块组、高回声组和低回声组。
According to the plaque characteristics, objects were divided into non-plaque group, hyperechoic group and hypoechoic group.
根据斑块声像性质将研究对象分为无斑块组、高回声组和低回声组。
According to the plaque characteristics, objects were divided into non-plaque group, hyperechoic group and hypoechoic group.
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