十万个为什么·科学启蒙30篇（4）

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为什么飞机高空舷窗多为圆形

Early jet planes had square windows, but several crashes revealed dangerous structural weaknesses at the corners.
Sharp corners concentrate stress when cabin pressure increases during flight at high altitudes.
Round windows distribute that pressure evenly across the curved surface without creating weak points.
At cruising altitude, the air pressure inside the cabin is much higher than outside the plane.
This pressure difference pushes outward on every part of the fuselage, especially around openings.
Engineers use rounded shapes because they resist cracking under repeated pressurization cycles.
Modern aircraft undergo thousands of simulated flights to test window durability and fatigue resistance.
Even small imperfections near square corners can grow into serious cracks over time.
Today’s acrylic and polycarbonate window materials also work best with smooth, curved designs.
This simple shape change dramatically improved passenger safety in commercial aviation history.

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

Engineers use rounded shapes because they resist cracking under repeated pressurization cycles. 工程师采用圆角设计，因其能更好抵抗反复增压导致的开裂。
This simple shape change dramatically improved passenger safety in commercial aviation history. 这一简单的形状改进，显著提升了民航史上的乘客安全。
Sharp corners concentrate stress when cabin pressure increases during flight at high altitudes. 在高空飞行时，机舱增压会使尖角处应力集中。

这篇中文题目最接近哪一句？为什么飞机高空舷窗多为圆形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？早期喷气式飞机采用方形舷窗，但多次事故暴露出其角落存在严重的结构弱点。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 Airplane Windows Are Round Instead of Square How to cook noodles A maths worksheet

Engineers use rounded shapes because they resist cracking under repeated pressurization cycles.

Engineers use rounded shapes because they resist cracking under repeated pressurization cycles.

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：Engineers use rounded shapes because they resist cracking under repeated pressurization cycles.