十万个为什么·科学阅读30篇（1）

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为什么冰刀能在结冰的水面上顺畅滑行？

Ice skates glide smoothly because pressure from the blade melts a thin layer of ice instantly.
This melted water acts like lubricant, reducing friction between metal and ice surface.
Although the air is cold, the localized pressure lowers ice’s melting point temporarily.
Once the skate passes, the water refreezes quickly due to surrounding low temperatures.
The smoother and harder the ice, the thinner and more effective this water film becomes.
Unlike snow or slush, solid ice provides uniform support and consistent melting behavior.
Skaters lean slightly to control edge angles, which changes pressure distribution and turning radius.
Scientists confirm this pressure-melting effect using high-speed imaging and micro-thermometers.
Some studies also show that surface molecules of ice are naturally disordered, aiding slipperiness.
Even at -20°C, this phenomenon occurs—but requires greater pressure for thinner films.

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Scientists confirm this pressure-melting effect using high-speed imaging and micro-thermometers. 科学家通过高速成像和微温度计证实了这种压融效应。
Even at -20°C, this phenomenon occurs—but requires greater pressure for thinner films. 即使在零下20摄氏度，该现象依然发生——但需要更大压力才能形成更薄的水膜。
This melted water acts like lubricant, reducing friction between metal and ice surface. 融化的水起到润滑作用，降低了金属与冰面之间的摩擦力。

这篇中文题目最接近哪一句？为什么冰刀能在结冰的水面上顺畅滑行？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？冰刀滑行顺畅，是因为刀刃施加的压力瞬间融化了一层薄冰。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 Do Ice Skates Glide Smoothly on Frozen Water? How to cook noodles A maths worksheet

Scientists confirm this pressure-melting effect using high-speed imaging and micro-thermometers.

Scientists confirm this pressure-melting effect using high-speed imaging and micro-thermometers.

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：Scientists confirm this pressure-melting effect using high-speed imaging and micro-thermometers.