油腔滑调

It's precisely that sort of slick sales-talk that I mistrust.

我不相信正是那种油腔滑调推销宣传。

Prescott's style, though in his diary he wrote "bother euphony", is euphonious.

普雷斯科特虽然在日记“厌谐音”，可是文章风格还是有点油腔滑调。

He speaks in unctuous tones.

油腔滑调。