One simple and (at least, in the movies) popular test to determine whether a diamond is real is to run it across a piece of glass.
确定钻石是真是假的一个简单而（至少在电影里）流行的测试是让它在一片玻璃上滚。
下金刚石取芯钻头。
In the past 10 years, Diamond electron has always been assisting domestic and international clients in reliable, efficient and economic means to run their electronic products.
得门电子在过去的十几年当中，得门电子一直在协助国内外客户以可靠、高效和经济的手段来运行他们的电子产品。
The average skier may find it inspirational to know that there is a really scary, black-diamond, expert run just beyond those trees, even if she never intends to use it.
如果普通的滑雪者知道在那片树林之后有一个真正高难度的黑钻专家雪道，他们会感到很放心。
下金刚石取芯钻头。
下金刚石取芯钻头。
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