VTI提供一组称为目的函数的hooks。

The VTI provides a set of hooks called purpose functions.

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该演示VTI UDR仅显示完整的目的函数集中的4个。

This demonstration VTI UDR shows only four of the complete set of purpose functions.

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您将需要为完整的VTI UDR实现所有其余的目的函数。

You will need to implement all of the remaining purpose functions for a complete VTI UDR.

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If you're writing a one line function, whose sole purpose in life is addition, and, clearly, this is about addition, well, then it's, in fact, A reasonable to use a shorter symbol like A, but I do have to specify it's type.

如果你在写一个一行的函数，它唯一的目的是,做加法，显然这是关于加法的，好的，实际上，用一个短的标识符是合理的，像，但是我必须指明它的类型。

哈佛公开课 - 计算机科学课程节选

The idea of a function is, that I'm going to capture a common pattern of computation.

函数的目的,就是寻找计算的共同模式。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's defined in CS50's library; its sole purpose in life is to ask the user for a floating point value and return it.

它被定义在CS50的函数库中，它的唯一目的是,向用户询问一个浮点数的值，然后返回它。

哈佛公开课 - 计算机科学课程节选