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

我不相信正是那种腔滑调推销宣传。

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

普雷斯科特虽然在日“讨厌谐音”，可是他文章风格还是有点腔滑调。

He speaks in unctuous tones.

他腔滑调。