It's a little more readable because I'm using a Boolean value that tells me, the programmer, this is true or this is false.

它更具有可读性一点,因为我使用了一个bool值，它告诉我或程序员，这是正确的或这是错误的。

哈佛公开课 - 计算机科学课程节选

John Now, you're going to hear John and I go back and forth a lot, well I'm certainly old time, but I'm also an old time Lisp programmer.

现在，你会听到我和,来回的讲好多次，好吧我当然是个老学究，但是我也是一个老lisp程序员。

麻省理工公开课 - 计算机科学及编程导论课程节选