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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.
聲音2：本用回聲定位來了解他周圍的世界。回聲定位是動物和人類使用的一種聲音系統(tǒng)。首先，動物或人發(fā)出聲音。聲音碰到附近的物體時發(fā)生反射。之后聲音會回到動物或人的耳朵。聲音返回的時間越短，物體就越近。返回的聲音越多，物體就越大。
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.
聲音1：有些動物用回聲定位法在難以看清的地方移動。例如，小型飛行哺乳動物蝙蝠，就利用回聲定位在夜間飛行。它們用嘴發(fā)出尖銳的聲音。之后傾聽聲音的回響。
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