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钻井机的钻头之所以能穿过钢铁般的岩层，金属切割刀之所以能使金属一分为二，玻璃刀之所以能在玻璃上开辟出“一条小道”，这都是因为钻头和刀日上镶着了亨有“硬度之王”美誉的金刚石。女人们之所以喜爱钻石首饰，是因为首饰中的金刚石璀灿夺目，迎合了她们爱美的天性。看到
The drill bit of the drilling machine can pass through the steel rock formation. The metal cutting knife can divide the metal into two. The glass knife can open up a “path” on the glass. This is because of the drill bit and the knife day. It is set with diamonds that are known as the “King of Hardness”. The reason why women love diamond jewelry is because the diamonds in the jewelry are dazzling and appealing to their beauty. see