STEM与日常科技·英语30篇（9）

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LED灯泡如何节省75%的电能

LED bulbs convert over 90% of electricity into light, while incandescent bulbs waste most as heat.
They last 25 times longer than traditional bulbs, reducing replacement frequency and waste.
A 10-watt LED produces as much light as a 60-watt incandescent bulb.
Drivers inside the bulb regulate current to prevent overheating and ensure steady brightness.
Unlike fluorescents, LEDs contain no mercury and turn on instantly at full power.
Their small size allows creative lighting designs in furniture, mirrors, and even clothing.
Smart LEDs can change color temperature to match natural daylight cycles for better sleep.
Widespread adoption has helped some cities cut streetlight energy use by nearly half.

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

A 10-watt LED produces as much light as a 60-watt incandescent bulb. 10瓦LED灯的亮度相当于60瓦白炽灯。
They last 25 times longer than traditional bulbs, reducing replacement frequency and waste. 其寿命是传统灯泡的25倍，降低了更换频率和废弃物产生。
Drivers inside the bulb regulate current to prevent overheating and ensure steady brightness. 灯内驱动器调节电流，防止过热并确保亮度稳定。

这篇中文题目最接近哪一句？ LED灯泡如何节省75%的电能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灯泡将90%以上的电能转化为光，而白炽灯则将大部分电能浪费为热量。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 Bulbs Cut Energy Use by 75% How to cook noodles A maths worksheet

A 10-watt LED produces as much light as a 60-watt incandescent bulb.

A 10-watt LED produces as much light as a 60-watt incandescent bulb.

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 10-watt LED produces as much light as a 60-watt incandescent bulb.