He wanted to build institutions that would be used for the sole purpose of perfecting the slave into the perfect worker.

因而需要建立一些特殊机构,这些机构只用于一个目的,就是能够让奴隶变成完美的工人

耶鲁公开课 - 美国内战与重建课程节选

In American law, you cannot terminate an employee, for the sole purpose of age.

美国法律规定，如果你仅因为年龄原因辞退员工，

退休很神奇 - SpeakingMax英语口语达人

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

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