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Jyutping ping4 sam1 jik6 hei3
Pinyin píng xīn yì qì

Definitions (Wiktionary)
  1. phrase, idiomatic, uncommon
    Synonym of 平心靜氣/平心静气 (píngxīnjìngqì, “calm, dispassionate”).
    (syn.) 平心静气, 平心靜氣