Bats emit high-frequency sounds and use the returning echoes to spot obstacles in their surroundings.

蝙蝠发出高频声音，并利用返回的回声来发现周围的障碍物。

It could send out radio signals and measure the returning echoes from nearby objects in space, including planets and asteroids.

它可以发出无线电信号并测量来自太空中附近物体（包括行星和小行星）的返回回声。