This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.

这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。

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Practical calculation results show that the calculation iteration Numbers can be reduced by 25%, and operational speed increases greatly.

经实际运算检验，运用该方法可以大幅度提高运算速度，运算的迭代次数减少25%。

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Also, what's the energy per photon of this red laser pointer, and then it's also worth trying a calculation dealing with intensity. So let's also try calculating the numbers of photons that would be emitted by this laser pointer, if, for example, we were to use it for 60 seconds and this were a one milliwatt laser.

同样，红色激光笔的,每个光子能量是多少，这也值得用处理强度的方法计算一下,让我们也计算一下,有多少光子会从这个激光笔射出，举个例子，如果我们使用它持续60秒,这里会有一毫瓦的激光。

麻省理工公开课 - 化学原理课程节选

Even in nations that have more experience with legally recognized same-sex pairing and splitting, calculation of divorce rates is often hampered by small numbers.

WSJ: Gay Divorce Rate Proves Hard to Measure

But Waldrum and his colleagues carried out a theoretical calculation of the risk of loss of life due to lightning in a similar building frequented by large numbers of people, in a similar setting - assuming the lack of any lightning protection.

BBC: What is the chance of lightning striking St Peter's?