Dual-band is a tech word for a phone, radio, or Wi-Fi box that can use two different kinds of signal, not just one. Think of each “band” as a radio road: the machine can drive on two roads.

Dual-band Dual-band is a tech word是一個科技用語 that can use two different kinds of signal, not just one指能使用兩種不同訊號、不只一種的 for a phone, radio, or Wi-Fi box手機、無線電或Wi-Fi分享器 Think of把 each "band"每一個「band」 as a radio road想成一條無線電道路：the machine這台機器 can drive on two roads可以在兩條路上行駛

That is why older phone ads said a dual-band phone could work in more than one country — different places used different signal types, so you needed both.

That is why這就是為什麼 older phone ads以前的手機廣告 said會說 a dual-band phone could work in more than one country雙頻手機可以在不只一個國家使用——different places used different signal types不同地方用的訊號類型不同 so you needed both所以兩種都需要

Though actually, almost every phone now uses many more than two bands; people still say dual-band a lot about home Wi-Fi, where one band is the slower, longer-reaching one and the other is faster but does not go as far.

Though actually不過其實 almost every phone now uses many more than two bands現在幾乎每支手機用的頻段都遠遠不只兩個；about home Wi-Fi講到家用Wi-Fi時 people still say dual-band a lot人們還是很常說dual-band，where one band is the slower, longer-reaching one其中一個頻段比較慢、傳得比較遠 and the other is faster but does not go as far另一個比較快、但傳得比較近

Shop language, not fancy language. You see it on boxes.

Shop language這是賣場用語，not fancy language不是花俏的詞；on boxes在包裝盒上 You see it你會看到它