寶石級別的鑽石確實沒有實際用途，但是便宜的，黑不溜秋的細小鑽石，廣泛使用在工業上。價錢出到幾百美元，砍樹的電鋸就會有鑽石

來源: thore 於 2025-09-06 12:16:48 [舊帖] [給我悄悄話] 本文已被閱讀：次

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