Placing it there was the idea of Richard Wukich, an art professor at Slippery Rock University in Pennsylvania.

VOA: special.2009.06.22

And so in the sentence that we've just looked at at some length now we have embodied in the form of a shifting argument - a really slippery argument -- the two senses of the word vocation: vocation as a job and vocation as a divine calling.

所以在我们详细看过的句子里,现在我们把他具体化成为论点的形式,这是一种狡猾的论辩--vocation的两种含义：,作为工作或者作为神的召唤。

耶鲁公开课 - 弥尔顿课程节选

We don't want to get the Supreme Court into making fine distinctions about what is better than others, because that will lead us down a slippery slope.

VOA: special.2011.07.04

It is a slippery slope. And, we're not careful, before we know it all of us will be in a much more dire situation."

VOA: standard.2009.11.11