Bluetooth is a short-range wireless system: radio waves that let devices next to each other talk without a cable. You use it to join a phone to a speaker, a keyboard or printer to a computer, a watch to a phone, or earbuds to a laptop. It is for things in the same room, more or less — not for the whole internet.

Bluetooth is a short-range wireless systemBluetooth是一種短距離的無線系統：radio waves that let devices next to each other talk without a cable讓彼此靠近的裝置不用線就能溝通的無線電波。You use it to join你用它把 a phone to a speaker手機接上喇叭, a keyboard or printer to a computer鍵盤或印表機接上電腦, a watch to a phone手錶接上手機, or earbuds to a laptop或耳機接上筆電。It is for things in the same room它是給同一個空間裡的東西用的, more or less差不多是這樣 — not for the whole internet而不是給整個網路用的。

That longer, wider job is Wi‑Fi. The name is a brand and a standard, so it is usually written with a capital B. People also use it loosely as a verb in speech (“just Bluetooth the file”), which is informal.

That longer, wider job那個範圍更大、更遠的工作 is Wi‑Fi是Wi-Fi在做的。The name is a brand and a standard這個名字既是品牌也是標準, so it is usually written with a capital B所以通常會大寫開頭寫成B。People also use it loosely as a verb in speech人們口語上也會鬆散地把它當動詞用 (“just Bluetooth the file”“just Bluetooth the file”), which is informal這是比較口語的用法。

The English words are blue + tooth, but that is a translation of an old name, not a description of the technology. It copies Old Norse Blátǫnn (Danish Blåtand), the nickname of the 10th-century Danish king Harald Bluetooth. The companies that built the standard named it after him because he was remembered for joining separate peoples together — as the radio link joins separate gadgets. Nothing here is about blue teeth.

The English words are blue + tooth英文字面上是blue加tooth, but that is a translation of an old name但那是一個舊名字的翻譯, not a description of the technology不是在描述這個技術本身。It copies它借用自 Old Norse BlátǫnnOld Norse Blátǫnn (Danish BlåtandDanish Blåtand), the nickname of the 10th-century Danish king Harald Bluetooth10世紀丹麥國王「藍牙哈拉爾」的綽號。The companies that built the standard named it after him建立這個標準的公司用他的名字來命名 because he was remembered for joining separate peoples together因為人們記得他把分裂的民族連結在一起 — as the radio link joins separate gadgets就像這個無線電連結把不同的裝置連在一起一樣。Nothing here is about blue teeth這整件事跟「藍色的牙齒」一點關係都沒有。