Give me a concept, return to you a product.

给我一个概念，还您一款产品。

youdao

For most people, that's a difficult concept and — I think I may have mentioned some of this before, but let me give this history.

这个概念对大多数人来说有些难，我记得我之前提及过其中一些，但还是让我来讲述一下它的历史。

youdao