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Voice 2: Ben uses echolocation to understand the world around him. Echolocation is a sound system used by animals, and humans. First, the animal or person makes a sound. The sound bounces off objects nearby. The sound then returns to the animal or person's ears. The shorter it takes for a sound to come back, the closer the object is. The more sound that comes back, the larger the object is.
声音2：本用回声定位来了解他周围的世界。回声定位是动物和人类使用的一种声音系统。首先，动物或人发出声音。声音碰到附近的物体时发生反射。之后声音会回到动物或人的耳朵。声音返回的时间越短，物体就越近。返回的声音越多，物体就越大。
Voice 1: Some animals use echolocation to move in areas where it is difficult to see. For example, bats, small flying mammals, use echolocation to fly at night. They make high pitched noises with their mouth. They listen for the sound to come back.
声音1：有些动物用回声定位法在难以看清的地方移动。例如，小型飞行哺乳动物蝙蝠，就利用回声定位在夜间飞行。它们用嘴发出尖锐的声音。之后倾听声音的回响。
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