十万个为什么·科学阅读30篇（9）

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为什么有些昆虫能在水面上行走而不破坏水面？

Water molecules at the surface cling tightly to each other, forming a thin elastic layer called surface tension.
Small insects like water striders have light bodies and long, hydrophobic legs that distribute their weight evenly.
Their legs press down gently, but not hard enough to overcome the water’s upward pull from cohesion.
This allows them to skate across ponds without sinking or creating ripples that break the film.
Scientists measure this force using units called millinewtons per meter, which quantify how much pull exists at the boundary.
Even slight contamination, like soap or oil, weakens surface tension and makes walking impossible for these bugs.
Researchers study this phenomenon to design micro-robots that mimic nature’s efficient water locomotion.
It also helps explain why dew drops bead up on spiderwebs instead of spreading flat.
Surface tension is stronger in cold water, so some insects move more easily on chilly morning ponds.
This invisible force shapes everything from cell membranes to industrial cleaning processes.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

This invisible force shapes everything from cell membranes to industrial cleaning processes. 这种无形之力，从细胞膜结构到工业清洗工艺，无处不在。
Researchers study this phenomenon to design micro-robots that mimic nature’s efficient water locomotion. 研究人员通过研究这一现象，设计模仿自然高效水上运动的微型机器人。
It also helps explain why dew drops bead up on spiderwebs instead of spreading flat. 它也能解释为何露珠在蜘蛛网上聚成球状，而非平铺展开。

这篇中文题目最接近哪一句？为什么有些昆虫能在水面上行走而不破坏水面？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？水表面的分子彼此紧密吸附，形成一层薄而富有弹性的膜，即表面张力。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Some Insects Walk on Water Without Breaking the Surface How to cook noodles A maths worksheet

This invisible force shapes everything from cell membranes to industrial cleaning processes.

This invisible force shapes everything from cell membranes to industrial cleaning processes.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：This invisible force shapes everything from cell membranes to industrial cleaning processes.