dB is the short written form of decibel (or decibels), the unit people use for how strong a sound is — and, in technical work, for some other kinds of signal too. You see it on headphones, concert notices, factory rules, and phone settings.

dB is the short written form of decibel (or decibels)dB是decibel（或decibels）的簡寫，the unit people use for how strong a sound is是人們用來表示聲音強度的單位 — and, in technical work, for some other kinds of signal too在技術工作裡，也用來表示其他種類的信號。You see it on headphones, concert notices, factory rules, and phone settings你會在耳機、演唱會公告、工廠規定和手機設定裡看到它。

A bigger number means a stronger sound, but the scale is not a simple straight line: going up a little in dB can be a much bigger jump in the real sound than the numbers make you feel. Though actually, engineers also use dB for things that are not sound, like radio signals; in school and daily life it almost always means loudness.

A bigger number means a stronger sound數字越大代表聲音越強，but the scale is not a simple straight line但這個尺度不是簡單的直線關係：going up a little in dB can be a much bigger jump in the real sound than the numbers make you feeldB數字上升一點點，實際聲音的跳動可能比數字給人的感覺大得多。Though actually不過其實，engineers also use dB for things that are not sound, like radio signals工程師也會把dB用在不是聲音的東西上，像是無線電信號；in school and daily life it almost always means loudness但在學校和日常生活裡，它幾乎都是指音量。

You write dB with a small d and a capital B. Aloud, people say decibel, or sometimes dee-bee.

You write dB with a small d and a capital B寫的時候，dB要用小寫d和大寫B。Aloud, people say decibel, or sometimes dee-bee唸出來的時候，人們會說decibel，有時候也會說dee-bee。