如果质密物体的质量，大于，太阳质量的三倍，毫无疑问我们就认为，它是个黑洞，从那时起，很多黑洞。
And clearly, if the mass of that compact object is way larger than three solar masses, then there is no doubt in our minds that this is a black hole.
这个道理可以参考著名的爱因斯坦质能方程式，E=mc2, 能量E是质量m乘以光速c的平方项。
Einstein's famous equation, E=mc2, outlines how energy is equivalent to mass times the square of the speed of light.
大多数人仍然希望自己的项目按时、按质、按预算完成。这就构成了著名的时间、质量和成本的三角关系。
Most people still want their projects to be on time, meet quality objectives, and not cost more than the budget. These form the classic time, quality, cost triangle.
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