STEM与日常科技·英语30篇（3）

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伯努利原理与地铁站台安全线的科学依据

When a fast train passes a platform, air between the train and passenger moves faster than surrounding air.
According to Bernoulli’s principle, faster-moving air exerts lower pressure than slower-moving air.
This pressure difference creates a subtle but real inward force pulling objects toward the moving train.
That’s why standing too close feels unnerving—and why platforms mark safety lines clearly.
The effect is stronger with higher speeds, wider trains, and tighter platform gaps.
Even bicycles or loose coats can be tugged dangerously if someone leans past the line.
Ventilation systems in underground stations must account for this airflow disturbance during peak hours.
Some newer platforms install platform screen doors partly to eliminate this aerodynamic risk entirely.
Similar physics explains why airplanes lift off and why shower curtains billow inward during hot showers.
Safety lines exist not just as warnings—but as visible boundaries against invisible forces.

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

According to Bernoulli’s principle, faster-moving air exerts lower pressure than slower-moving air. 根据伯努利原理，流速越快的空气压强越低。
That’s why standing too close feels unnerving—and why platforms mark safety lines clearly. 这正是站得太近会令人不安的原因，也是站台明确标出安全线的原因。
The effect is stronger with higher speeds, wider trains, and tighter platform gaps. 车速越高、列车越宽、站台间隙越小，这种效应越明显。

这篇中文题目最接近哪一句？伯努利原理与地铁站台安全线的科学依据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？当快速列车驶过站台时，列车与乘客之间的空气流速高于周围空气。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） Bernoulli’s Principle and the Safety Line at Train Platforms How to cook noodles A maths worksheet

According to Bernoulli’s principle, faster-moving air exerts lower pressure than slower-moving air.

According to Bernoulli’s principle, faster-moving air exerts lower pressure than slower-moving air.

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：According to Bernoulli’s principle, faster-moving air exerts lower pressure than slower-moving air.