科学素养与生活应用·英语30篇（1）

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为何LED灯泡比白炽灯更耐用且耗电更少

LEDs produce light by moving electrons through semiconductor materials—not by heating a filament.
Over 90% of energy in incandescent bulbs becomes wasted heat, while LEDs convert most to visible light.
Their solid-state design lacks fragile parts, so vibrations or frequent switching rarely cause failure.
Thermal management matters: built-in heat sinks prevent overheating that shortens LED lifespan.
Smart LEDs can dim smoothly, change color, and sync with home automation systems easily.
Manufacturers use phosphor coatings to convert blue LED light into warm white tones people prefer.
Life ratings of 25,000 hours mean an LED bulb may last over 20 years with typical use.
This shift reflects progress across physics, materials science, and sustainable product engineering.

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

Thermal management matters: built-in heat sinks prevent overheating that shortens LED lifespan. 散热管理至关重要：内置散热器可防止过热，延长LED寿命。
This shift reflects progress across physics, materials science, and sustainable product engineering. 这一转变体现了物理学、材料科学及可持续产品工程的进步。
LEDs produce light by moving electrons through semiconductor materials—not by heating a filament. LED通过让电子穿过半导体材料发光，而非加热灯丝。

这篇中文题目最接近哪一句？为何LED灯泡比白炽灯更耐用且耗电更少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？ LED通过让电子穿过半导体材料发光，而非加热灯丝。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 LED Bulbs Last Longer—and Use Less Power—Than Incandescent Ones How to cook noodles A maths worksheet

Thermal management matters: built-in heat sinks prevent overheating that shortens LED lifespan.

Thermal management matters: built-in heat sinks prevent overheating that shortens LED lifespan.

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：Thermal management matters: built-in heat sinks prevent overheating that shortens LED lifespan.