What does pop music do for us that's very helpful?

就这点而言流行音乐对我们来说有什么用处呢？

耶鲁公开课 - 聆听音乐课程节选

Why is this useful?

这样做有什么用处呢？

哈佛公开课 - 计算机科学课程节选

Milton explains that the Licensing Order of 1643 is ineffective, it's useless because, and I'm quoting here, " order avails nothing to the suppressing of scandalous, seditious, and libellous books, which were mainly intended to be suppressed."

弥尔顿解释说《出版管制法》毫无作用，一无是处，我引用他的话说原因“,因为这个管制法对控制诽谤性的，有煽动性的，中伤他人的需要被控制的书籍毫无用处“

耶鲁公开课 - 弥尔顿课程节选

One of the forms of processing that happens, that's very important in human gene expression is that some of the sections of the DNA molecule are not really necessary for describing the protein.

在人类的基因表达中,有一种非常重要的加工形式,那就是在DNA分子中有一些片段,对于编码蛋白质而言毫无用处

耶鲁公开课 - 生物医学工程探索课程节选