The stuff in tea and coffee that wakes you up is caffeine; caffeinated is the describing word. A caffeinated drink contains that stimulant. In ordinary talk it is the opposite of decaf: “Is this caffeinated or decaf?” Though actually it does not mean extra-strong — an ordinary cup of coffee is already caffeinated; it only tells you the caffeine is in there, not how much.

The stuff in tea and coffee that wakes you up is caffeine茶和咖啡裡讓你清醒的那個東西叫caffeine caffeinated is the describing wordcaffeinated就是它的形容詞 A caffeinated drink contains that stimulant一杯caffeinated的飲料就是含有這種提神物質的飲料 In ordinary talk it is the opposite of decaf在日常說法裡，它是decaf（去咖啡因）的反義詞 "Is this caffeinated or decaf?"「Is this caffeinated or decaf?」 Though actually it does not mean extra-strong不過其實它不代表特別濃 an ordinary cup of coffee is already caffeinated一杯普通的咖啡本來就是caffeinated的 it only tells you the caffeine is in there它只是告訴你裡面有咖啡因 not how much而不是有多少

Informally, of a person, caffeinated can mean buzzing, jittery, or comically lively from coffee. There is a verb too, to caffeinate. Packet English and café English use the adjective constantly; careful science writing may prefer “containing caffeine.”

Informally, of a person非正式地用在形容一個人時 caffeinated can mean buzzing, jittery, or comically lively from coffeecaffeinated可以指因為喝了咖啡而亢奮、緊張兮兮、或誇張地活蹦亂跳 There is a verb too, to caffeinate也有動詞形式to caffeinate Packet English and café English use the adjective constantly包裝文字和咖啡館用語會不斷用到這個形容詞 careful science writing may prefer "containing caffeine."講究的科學寫作可能比較偏好用「containing caffeine」