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black diamond

noun
🔊/ˌblæk ˈdaɪmənd/
🔊/ˌblæk ˈdaɪmənd/
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  1. [countable] (British English, informal) a piece of coal 煤块
  2. [uncountable, countable] a dark form of diamond黑金刚石；黑钻石
  3. [countable] (North American English) a slope that is difficult to ski down黑钻石坡道（难以下滑的陡坡）
    • a black diamond run黑钻石滑道