The maximum distance for a Wi-Fi extender varies depending on the model, but most can effectively extend your wireless signal between 800 and 2,500 square feet. Some high-end models may reach even farther, especially if they feature external antennas or are part of a mesh system with additional dedicated wireless access points.
// 易错点3：跨度计算公式写反（stack[...]-i）→ 结果为负数，完全错误
，这一点在91视频中也有详细论述
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Researchers in California are experimenting with air driven actuation