He weighed in with a Latin quotation.

他引用了一条拉丁文语。

Never too Old to Learn is an idiom.

'活到老学到老'语。

He has a great number of English idioms at command.

他掌握了大量的英语语。

Abstract: Generally speaking, idioms include proverbs, phrases, vulgarism and two-part allegorical sayings.

从广义来，习语包括语、谚语、俗语歇后语等。