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.
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