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Jyutping sai3 si2
Pinyin xì shí

Definitions (粵典–words.hk)
  1. 副詞
    小時候
    when one was young

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Jyutping sai3 si4
Pinyin xì shí

Definitions (CC-CANTO)
  1. in childhood; when one was a small child
Definitions (Kaifangcidian)
  1. 小時候 – 小时候
  2. 小的時候 – 小的时候