为什么蝙蝠晚上飞行不撞墙?（英文）

作者：姜琴

来源：阅读, 2019, (37): 38.

<正>Bats use their ears to find their way in the dark(在黑暗中).They make sounds(发出声音)as they fly. When the sounds hit(碰撞)things, they bounce back(反弹回来)to the bat’s ears.Bats then fly away from those hard(硬的)things.