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Why Do Some Insects Walk on Water?
为什么有些昆虫能在水面上行走？
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Water has a strong surface layer called surface tension.水有一层强韧的表面层，称为表面张力。
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Tiny insects like water striders are light enough to sit on it.水黾等微小昆虫体重很轻，能稳稳停在水面上。
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Their legs spread weight over a large area without breaking the surface.它们的腿将体重分散到较大面积，不会戳破水面。
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Tiny hairs on their legs trap air and increase buoyancy.腿上的细小绒毛能困住空气，增强浮力。
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This lets them skate, jump, and hunt on ponds and streams.这使它们能在池塘和溪流上滑行、跳跃和捕食。
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Surface tension is like an invisible elastic skin on water.表面张力就像一层看不见的弹性水膜。
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Without it, many small creatures could not live on water.没有它，许多小型生物就无法在水面生存。
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Scientists study this to design better waterproof materials.科学家研究这一现象，以设计更优的防水材料。