This method is useful for making very detailed objects.

VOA: special.2009.09.09

So, whether or not the email is addressed specifically to you in like the two field or if maybe you were BCC'd or it's a big email list of which you're just part, that could signify that this is in fact useful for you.

所以，不管这个邮件是不是,单独发给你的,或者这个邮件有一个大的邮件列表,而你正在其中，其实这也暗示了,这个邮件对你是有用的。

哈佛公开课 - 计算机科学课程节选

Now as an aside, turns out you can do more interesting formatting with printf, and this is useful even for ASCII art purposes.

说点题外话，结果你可以用printf来打印其他的格式,这是非常有用的,甚至是为了ASCII艺术的目的。

哈佛公开课 - 计算机科学课程节选

For those of you for--with iPhone 4, by far, the most useful application for 99 cents is this flashlight in the middle of the night.

对你们这些用iPhone，4的人，目前，在午夜最有用的东西,就是这个99美分的闪光灯应用了。

哈佛公开课 - 计算机科学课程节选