STEM与日常科技·英语30篇（9）

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降噪耳机如何安静世界

Microphones outside each earcup pick up ambient noise like traffic or airplane hum.
A digital chip analyzes sound waves in real time and generates inverse-phase signals.
When original and inverted waves meet, they cancel each other through destructive interference.
This works best for constant low-frequency sounds, not sudden high-pitched noises like alarms.
Passive insulation from earcup padding adds another 15–20 dB of quieting on its own.
Battery power enables active processing, so turning it off reduces effectiveness significantly.
Some models adapt cancellation strength based on whether you’re walking, sitting, or flying.
Newer versions use AI to predict noise patterns and adjust faster than older analog systems.

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

Battery power enables active processing, so turning it off reduces effectiveness significantly. 电池供电支持主动降噪处理，关闭后降噪效果显著下降。
Microphones outside each earcup pick up ambient noise like traffic or airplane hum. 每个耳罩外侧的麦克风拾取环境噪音，如交通声或飞机轰鸣。
A digital chip analyzes sound waves in real time and generates inverse-phase signals. 数字芯片实时分析声波，并生成反向相位信号。

这篇中文题目最接近哪一句？降噪耳机如何安静世界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？每个耳罩外侧的麦克风拾取环境噪音，如交通声或飞机轰鸣。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 Quiet the World How to cook noodles A maths worksheet

Battery power enables active processing, so turning it off reduces effectiveness significantly.

Battery power enables active processing, so turning it off reduces effectiveness significantly.

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：Battery power enables active processing, so turning it off reduces effectiveness significantly.