STEM与日常科技·英语30篇（7）

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交通信号灯为何自动变换

Modern traffic lights use embedded sensors and timers to adjust signal timing dynamically.
Induction loop detectors in the road sense metal from vehicles waiting at intersections.
Some systems also receive real-time data from GPS-enabled city traffic management centers.
During rush hour, green lights stay longer for busier roads to reduce congestion.
At night, signals often switch to flashing yellow or all-red modes for safety.
Cameras and AI analyze vehicle flow patterns to predict optimal light sequences.
Solar-powered controllers allow remote intersections to function without grid electricity.
Emergency vehicles can trigger priority green lights using radio frequency signals.
Each intersection’s logic is programmed to balance efficiency and pedestrian safety.
Engineers test these systems with simulation software before installing them on real streets.

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

Solar-powered controllers allow remote intersections to function without grid electricity. 太阳能控制器使偏远路口无需电网供电即可运行。
Emergency vehicles can trigger priority green lights using radio frequency signals. 应急车辆可通过射频信号触发优先绿灯。
Each intersection’s logic is programmed to balance efficiency and pedestrian safety. 每个路口的控制逻辑均兼顾通行效率与行人安全。

这篇中文题目最接近哪一句？交通信号灯为何自动变换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？现代交通信号灯利用嵌入式传感器和定时器动态调整信号时长。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 Traffic Lights Change Automatically How to cook noodles A maths worksheet

Solar-powered controllers allow remote intersections to function without grid electricity.

Solar-powered controllers allow remote intersections to function without grid electricity.

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：Solar-powered controllers allow remote intersections to function without grid electricity.