飞行蝙蝠themakewhenfromhardway
摘要：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.
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