数学方面，学会了100以内的认读，学会了单、双数的概念。
1. 选择步长序列（如: n/2, n/4, ..., 1）
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3. Privacy and Surveillance Concerns
Aside from that, there are the scant few standalone Wi-Fi extenders that sit on an end table or a desk, and those look pretty similar to regular ol’ routers. But make no mistake, anything labeled as an extender or a “Wi-Fi repeater” will need an anchor router in order for it to work.
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