科技与生活常识·英语30篇（1）

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LED灯为何比老式灯泡节能85%且寿命更长

LEDs create light by passing electricity through a semiconductor material, not by heating a filament.
This process, called electroluminescence, wastes very little energy as heat.
Traditional incandescent bulbs lose over 90% of their energy as invisible infrared radiation.
A 10-watt LED produces as much visible light as a 60-watt incandescent bulb.
LEDs last 25,000 hours on average—25 times longer than incandescents and three times longer than CFLs.
They contain no mercury, unlike compact fluorescent lamps, making disposal safer.
Dimmable LEDs work with modern switches, though compatibility depends on driver circuit design.
Heat sinks built into LED fixtures draw heat away from sensitive electronics to maintain performance.
Smart LEDs can change color temperature or sync with sunrise/sunset via apps and timers.
Widespread adoption has cut residential lighting electricity use by nearly 40% since 2010.

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

This process, called electroluminescence, wastes very little energy as heat. 这种称为电致发光的过程几乎不以热量形式浪费能量。
They contain no mercury, unlike compact fluorescent lamps, making disposal safer. LED不含汞，而紧凑型荧光灯含汞，因此更易安全处置。
Traditional incandescent bulbs lose over 90% of their energy as invisible infrared radiation. 传统白炽灯超过90%的能量以不可见红外辐射形式散失。

这篇中文题目最接近哪一句？ LED灯为何比老式灯泡节能85%且寿命更长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通过电流流经半导体材料发光，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） How LED Lights Use 85% Less Energy Than Old Bulbs — And Last Longer How to cook noodles A maths worksheet

This process, called electroluminescence, wastes very little energy as heat.

This process, called electroluminescence, wastes very little energy as heat.

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：This process, called electroluminescence, wastes very little energy as heat.