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How Do Bats Find Their Way in Total Darkness?
蝙蝠怎么能在完全黑暗中找到路？
精读先不看文字，完整听一遍。
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Bats send out high-pitched sounds that humans cannot hear.蝙蝠发出人类听不见的高音。
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These sound waves bounce off objects and return as echoes.这些声波碰到物体后反弹，形成回声。
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Their big ears catch the echoes to build a mental map.它们的大耳朵接收回声，构建脑海中的空间地图。
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This skill is called echolocation and works like sonar.这种能力叫回声定位，原理类似声呐。
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Some bats can detect insects as thin as a human hair.有些蝙蝠能探测到细如人发的昆虫。
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They use it to fly, hunt, and avoid trees at night.它们靠它在夜间飞行、捕食和避开树木。
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
- Bats send out high-pitched sounds that humans cannot hear. 蝙蝠发出人类听不见的高音。
- This skill is called echolocation and works like sonar. 这种能力叫回声定位，原理类似声呐。
- These sound waves bounce off objects and return as echoes. 这些声波碰到物体后反弹，形成回声。
④ 懂 · 选一选
⑤ 今天会说这一句
Bats send out high-pitched sounds that humans cannot hear.
⑥ 跟读并录音
Bats send out high-pitched sounds 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：Bats send out high-pitched sounds 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。