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Jyutping gaa3 fe1 jan1
Pinyin kā fēi yīn

Definitions (CC-CEDICT)
  1. caffeine (loanword)
Definitions (粵典–words.hk)
  1. 名詞、外來語
    一種​中樞神​經興​奮劑​,​能夠​暫時​驅​走​睡意​並恢​復​精力​;​一般​可以​喺​咖啡​、​茶​、​能量​飲品​、​汽水​、​朱古力​等等​入面​揾​到
    caffeine
    • 唔喇,我夜晚飲有咖啡因嘅嘢會瞓唔着。
      唔喇,我夜晚饮有咖啡因嘅嘢会瞓唔着。
      m4 laa3, ngo5 je6 maan5 jam2 jau5 gaa3 fe1 jan1 ge3 je5 wui3 fan3 m4 zoek6.
      No thanks. I can't sleep if I drink caffeinated stuff at night.
Definitions (Wiktionary)
  1. noun
    caffeine
    (syn.) 咖啡鹼, 咖啡碱
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你刚进食了那么多咖啡因还睡得了觉吗?
    你剛進食了那麼多咖啡因還睡得了覺嗎?
    nǐ gāng jìn shí le nà me duō kā fēi yīn hái shuì dé le jué ma ?
    • Will you be able to sleep with all that caffeine you've just had?
Examples (粵典–words.hk)
  1. Cantonese
    唔喇,我夜晚饮有咖啡因嘅嘢会瞓唔着。
    唔喇,我夜晚飲有咖啡因嘅嘢會瞓唔着。
    m4 laa3, ngo5 je6 maan5 jam2 jau5 gaa3 fe1 jan1 ge3 je5 wui3 fan3 m4 zoek6.
    • No thanks. I can't sleep if I drink caffeinated stuff at night.