Rough diamond prices have fallen even more, as much as 75 percent since their peak last July at some auctions.

钻石原石价格下跌更严重。比起去年7月在一些拍卖会上拍出的最高价，原始价格下降多达75%。

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The Raman spectra either did not show the diamond 1332 cm-1 peak or the peak was very weak, while the D-band and the graphite peak appeared clearly.

拉曼光谱要么不显示金刚石1332 cm - 1峰，要么显示的峰很弱。但D带和石墨峰值却清晰可见。

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The Diamond and Saetz paper that tried to calculate the peak of the curve for the US tells us that for federal income tax is probably around 54%.

FORBES: The Laffer Curve Appears in the UK