样式表使用count函数计算数组大小。

The stylesheet computes the array size with the count function.

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这允许应用程序创建一个计算数据库的查询。

This allows an application to create a query that evaluates a database function.

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测量质量无疑是困难的测量计算数量一样容易。

Measuring quality is difficult; measuring quantity is as easy as counting.

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And we can calculate that with the formula that we used, which was just n minus l minus 1 equals the number of nodes.

这个我们可以用我们以前用过的那个公式来计算，也就是节点数等于ｎ减去ｌ减去１

麻省理工公开课 - 化学原理课程节选

So what that means is the compiler is actually going to first "cast" so to speak 13 from whatever it is - to a float -- to a floating point value -- and then perform the division for us.

所以这里的意思是编译器将,做“计算“，譬如13这样一个浮点数,-到另一个浮点数-,然后为我们处理除法。

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And, in fact, these are the only two types of nodes that we're going to be describing, so we can actually calculate both the total number of notes and the number of each type of node we should expect to see in any type of orbital.

事实上，我们只,描述这两种节点，所以我们可以,计算任何轨道中的,总结点数以及各种节点数。

麻省理工公开课 - 化学原理课程节选