silver tongue

基本解释

A president with a big personal mandate, solid majorities in both chambers of Congress and a silver tongue ought to have been much braver.
总统享有强大的个人授权，在国会两院拥有压倒性票数，而且又能言善辩，他本应该更勇敢点的。
But many inventors have trouble with verbal acuity, and many politicians gifted with a silver tongue need to be schooled in the concepts they are perforce required to address.
但是，许多发明家的口头能力有麻烦，而许多政治家能说会道，但需要在他们需要讲述的概念上再受训练。
blog.sina.com.cn
The silver tongue that charmed America during the campaign has been replaced by a tin ear.
在竞选中令美国为之荣耀的能言善辩的他已经被一个不怎么听取民意的人替代。

The brainy self-made son of Cuban immigrants has a silver tongue and is often called a Republican Barack Obama (in a good way, you understand).
ECONOMIST: Lexington
He was everything Democrats were seen as through the eyes of the Republican opposition: an effete, Ivy League flip-flopper who could debate with a silver tongue but had no backbone.
FORBES: Mitt Romney is the John Kerry of The GOP