科技与生活常识·英语30篇（1）

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降噪耳机如何在不堵塞耳朵的情况下屏蔽世界噪音

Active noise-canceling (ANC) headphones use tiny microphones to detect incoming sound waves in real time.
A processor analyzes each wave’s frequency, amplitude, and phase within milliseconds.
Then it generates an ‘anti-noise’ sound wave with identical shape but inverted peaks and troughs.
When the original and anti-noise waves meet, they cancel each other out through destructive interference.
This works best for low-frequency, steady sounds like airplane engines or air conditioners.
Higher-pitched noises like voices or clattering dishes are harder to cancel completely.
Passive isolation—the physical seal of ear cups or tips—still blocks mid- and high-frequency noise effectively.
Battery power runs the microphone, chip, and speaker systems; turning ANC off extends playtime.
Some models adapt cancellation strength based on fit, altitude, or even walking motion.
The result is quiet focus without earplugs, pressure, or full sound isolation—ideal for awareness and comfort.

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

A processor analyzes each wave’s frequency, amplitude, and phase within milliseconds. 处理器在毫秒内分析每个声波的频率、振幅和相位。
Higher-pitched noises like voices or clattering dishes are harder to cancel completely. 人声、餐具碰撞等高频噪音则较难完全消除。
This works best for low-frequency, steady sounds like airplane engines or air conditioners. 该技术对飞机引擎、空调等低频稳定噪音效果最佳。

这篇中文题目最接近哪一句？降噪耳机如何在不堵塞耳朵的情况下屏蔽世界噪音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？主动降噪（ANC）耳机通过微型麦克风实时捕捉入耳声波。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） How Noise-Canceling Headphones Silence the World — Without Blocking Ears How to cook noodles A maths worksheet

A processor analyzes each wave’s frequency, amplitude, and phase within milliseconds.

A processor analyzes each wave’s frequency, amplitude, and phase within milliseconds.

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：A processor analyzes each wave’s frequency, amplitude, and phase within milliseconds.