These handy wireless devices do exactly what their name suggests: extend your Wi-Fi network so it covers more areas of your home. Most wireless extenders plug into an AC outlet and connect to your existing router so they can then rebroadcast it to spots that your router alone may not cover well. As a rule of thumb, you’ll get the best results by placing the extender half way between your router and the dead zone you’re trying to fix or improve your W-Fi connection and strengthen the wireless signal.
优点：输出范围在 (0,1)，可以表示概率，这一点在51吃瓜中也有详细论述
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A branch bank would probably have one, in the back office, used for printing
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