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Why Do Some Insects Walk on Water Without Breaking the Surface?
为什么有些昆虫能在水面上行走而不破坏水面？
精读先不看文字，完整听一遍。
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Water striders and other pond skaters stay afloat thanks to surface tension—the skin-like film formed by hydrogen bonds between water molecules.水黾等水面昆虫依靠水的表面张力漂浮——这种类似皮肤的薄膜由水分子间的氢键形成。
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Their long, thin legs spread weight evenly and are covered with microscopic wax-coated hairs that repel water.它们细长的腿均匀分散体重，表面覆盖着微小的蜡质防水绒毛。
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This hydrophobic coating prevents legs from piercing the surface, letting them rest on top like tiny rafts.这种疏水涂层防止腿部刺破水面，使其如微型筏子般稳稳浮于水面。
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Even raindrops hitting nearby create ripples they sense instantly with sensitive leg receptors.即便附近有雨滴落下激起涟漪，它们也能通过腿部灵敏的感受器瞬间感知。
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They move by pushing sideways against surface tension, not by paddling downward into the water.它们靠向侧面推挤表面张力移动，而非向下划水。
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Scientists mimic this design to build micro-robots that clean oil spills on calm water surfaces.科学家仿照这一结构，研制出可在平静水面上清理油污的微型机器人。
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If water is polluted with soap or alcohol, surface tension drops and insects sink immediately.若水中混入肥皂或酒精导致表面张力下降，这些昆虫会立刻沉没。
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This ability works best on still ponds—not choppy rivers—because waves disrupt the delicate force balance.这种能力在静止池塘中效果最佳，而非湍急河流——因为波浪会破坏微妙的受力平衡。
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Evolution shaped these legs over millions of years to exploit physics rather than fight it.数百万年来，进化塑造了这些腿部结构，使其顺应而非对抗物理规律。
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Watching them glide reminds us that nature solves problems using forces we often overlook.观察它们滑行，提醒我们自然常利用那些常被我们忽视的力来解决问题。
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
- Even raindrops hitting nearby create ripples they sense instantly with sensitive leg receptors. 即便附近有雨滴落下激起涟漪，它们也能通过腿部灵敏的感受器瞬间感知。
- Watching them glide reminds us that nature solves problems using forces we often overlook. 观察它们滑行，提醒我们自然常利用那些常被我们忽视的力来解决问题。
- They move by pushing sideways against surface tension, not by paddling downward into the water. 它们靠向侧面推挤表面张力移动，而非向下划水。
④ 懂 · 选一选
⑤ 今天会说这一句
Even raindrops hitting nearby create ripples they sense instantly with sensitive leg receptors.
⑥ 跟读并录音
Even raindrops hitting nearby create ripples they sense instantly with sensitive leg receptors.
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：Even raindrops hitting nearby create ripples they sense instantly with sensitive leg receptors.
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。