科学素养与生活应用·英语30篇（2）

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LED灯泡为何更耐用且耗电更少

LEDs produce light through electroluminescence—sending electrons through semiconductor materials.
No filament heats up, so almost all energy converts to visible light instead of wasted heat.
A typical 10-watt LED delivers the same brightness as a 60-watt incandescent bulb.
Because they lack fragile glass and filaments, LEDs withstand vibrations and frequent switching.
Most last 25,000 hours—over 20 times longer than traditional bulbs—cutting replacement costs.
Dimmable LEDs work with modern switches, though compatibility depends on driver circuit design.
Cooler operation lowers fire risk and reduces air-conditioning load in warm climates.
Recycling programs exist for LEDs, but their long lifespan delays e-waste accumulation significantly.

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

LEDs produce light through electroluminescence—sending electrons through semiconductor materials. LED通过电致发光发光——即让电子穿过半导体材料。
Most last 25,000 hours—over 20 times longer than traditional bulbs—cutting replacement costs. 大多数LED寿命达25000小时，是传统灯泡的20多倍，大幅降低更换成本。
Cooler operation lowers fire risk and reduces air-conditioning load in warm climates. 运行温度更低，降低了火灾风险，并在炎热气候中减轻空调负荷。

这篇中文题目最接近哪一句？ LED灯泡为何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通过电致发光发光——即让电子穿过半导体材料。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 How to cook noodles A maths worksheet

LEDs produce light through electroluminescence—sending electrons through semiconductor materials.

LEDs produce light through electroluminescence—sending electrons through semiconductor materials.

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：LEDs produce light through electroluminescence—sending electrons through semiconductor materials.