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He is a slippery customer, and should be carefully watched.

他可是个狡猾的主顾，得小心看着他。

《柯林斯英汉双解大词典》

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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

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

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

There was the mother who once turned to leave him with a screaming and squirming "slippery as a seal" infant.

CNN: Being Santa: 7 men share tales from behind the red suit

So should the Swede be seen now as a slippery customer, or as a football coach who had achieved modest success with England, and who is entitled to his private life?

BBC: SPORT | Football | Internationals | How did Eriksson survive?

Complicity is a slippery word, but there is a degree of truth in what he says.

ECONOMIST: East Timor