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Jyutping hoi1 coi2
Pinyin kāi cǎi

Definitions (CC-CEDICT)
  1. to extract (ore or other resource from a mine)
  2. to exploit
  3. to mine
Definitions (粵典–words.hk)
  1. 動詞
    挖掘​一​啲​喺​地底​嘅​資​源
    to extract; to exploit; to recover
    • 銀礦灣以前真係開採白銀嘅地方。
      银矿湾以前真系开采白银嘅地方。
      ngan4 kwong3 waan1 ji5 cin4 zan1 hai6 hoi1 coi2 baak6 ngan4 ge3 dei6 fong1.
      There indeed was a silver mine in Silver Mine Bay.
Definitions (Wiktionary)
  1. verb
    to mine; to extract; to exploit
    (syn.) 採掘, 開鑿, 采掘, 挖掘, 開掘, 开凿, 开掘, 發掘, 发掘
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #2328
Examples (粵典–words.hk)
  1. Cantonese
    开采石油
    開採石油
    hoi1 coi2 sek6 jau4
    • crude oil extraction
  2. Cantonese
    银矿湾以前真系开采白银嘅地方。
    銀礦灣以前真係開採白銀嘅地方。
    ngan4 kwong3 waan1 ji5 cin4 zan1 hai6 hoi1 coi2 baak6 ngan4 ge3 dei6 fong1.
    • There indeed was a silver mine in Silver Mine Bay.
  3. Cantonese
    茶果岭旧时以开采高岭土同花岗岩闻名。
    茶果嶺舊時以開採高嶺土同花崗岩聞名。
    caa4 gwo2 leng5 gau6 si4 ji5 hoi1 coi2 gou1 ling5 tou2 tung4 faa1 gong1 ngaam4 man4 ming4.
    • Cha Kwo Ling (in Hong Kong) was known for extracting kaolinite and graphite.
  4. Cantonese
    开采稀土嘅经济效益唔高。
    開採稀土嘅經濟效益唔高。
    • Economical benefit of extracting rare earth metal is not high.