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How Do Bats Find Their Way in the Dark?
蝙蝠是如何在黑暗中找到方向的？
精读先不看文字，完整听一遍。
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Bats cannot see well in total darkness, so they use sound instead of light.蝙蝠在完全黑暗中视力很差，因此依靠声音而非光线来感知环境。
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They send out high-pitched squeaks that humans cannot hear.它们发出人类听不到的高频尖叫声。
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These sounds bounce off walls, trees, and flying insects nearby.这些声音会从墙壁、树木及附近的飞虫身上反射回来。
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The bat listens carefully to the returning echoes to build a mental map.蝙蝠仔细聆听返回的回声，从而构建脑海中的空间地图。
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This process, called echolocation, helps them fly and catch food precisely.这种称为回声定位的过程，帮助它们精准飞行和捕食。
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Different bat species adjust their calls based on where they hunt and what they eat.不同蝙蝠种类会根据栖息地和食物类型调整叫声。
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Their large ears and sensitive hearing allow them to detect tiny time differences in echoes.它们巨大的耳朵和敏锐的听力，能察觉回声中极微小的时间差。
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Even baby bats practice echolocation before they can fly steadily.幼蝠甚至在尚未稳定飞行前就开始练习回声定位。
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Some moths have evolved ears to hear bat calls and escape quickly.一些蛾子进化出听觉器官，可探测蝙蝠叫声并迅速逃脱。
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Studying bat navigation helps engineers design better sonar and robot sensors.研究蝙蝠导航方式有助于工程师设计更优的声呐和机器人传感器。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- They send out high-pitched squeaks that humans cannot hear. 它们发出人类听不到的高频尖叫声。
- These sounds bounce off walls, trees, and flying insects nearby. 这些声音会从墙壁、树木及附近的飞虫身上反射回来。
- Even baby bats practice echolocation before they can fly steadily. 幼蝠甚至在尚未稳定飞行前就开始练习回声定位。
④ 懂 · 选一选
⑤ 今天会说这一句
They send out high-pitched squeaks that humans cannot hear.
⑥ 跟读并录音
They send out high-pitched squeaks that humans cannot hear.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：They send out high-pitched squeaks that humans cannot hear.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。