科学素养与生活应用·英语30篇（2）

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Wi-Fi信号为何难以穿透墙壁和楼板

Wi-Fi operates on radio frequencies—typically 2.4 GHz or 5 GHz—that interact differently with solid materials.
Dense substances like concrete, brick, or metal reflect or absorb signal energy, weakening transmission.
Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly.
Higher-frequency 5 GHz signals carry more data but penetrate walls less effectively than 2.4 GHz ones.
Router placement matters: central, elevated locations avoid obstructions and maximize coverage evenly.
Mesh networks solve this by using multiple nodes to relay signals around barriers instead of relying on one source.
Interference from microwaves, baby monitors, or neighboring Wi-Fi networks further disrupts stable connections.
Upgrading to Wi-Fi 6 improves efficiency in crowded environments but doesn’t eliminate physical signal loss.

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

Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly. 富含水的物体（如人体、鱼缸）也会显著散射 2.4 GHz 信号。
Router placement matters: central, elevated locations avoid obstructions and maximize coverage evenly. 路由器摆放位置很关键：置于中央、较高的位置可避开遮挡，实现均匀覆盖。
Interference from microwaves, baby monitors, or neighboring Wi-Fi networks further disrupts stable connections. 微波炉、婴儿监视器或邻近 Wi-Fi 网络产生的干扰，会进一步破坏连接稳定性。

这篇中文题目最接近哪一句？ Wi-Fi信号为何难以穿透墙壁和楼板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？ Wi-Fi 使用无线电频率（通常为 2.4 GHz 或 5 GHz）工作，不同固体会以不同方式影响这些信号。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 Wi-Fi Signals Struggle Through Walls and Floors How to cook noodles A maths worksheet

Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly.

Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly.

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：Water-rich objects—including human bodies and aquariums—also scatter 2.4 GHz waves significantly.