and most, perhaps, obviously-- if you're just spending your life floating in the scientist's lab, you're not actually accomplishing anything.

显而易见-,如果你只是漂浮在科学实验室里，你实际上没有完成任何事情。

耶鲁公开课 - 死亡课程节选

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