For such a big sum, we should attach importance to it.
数目如此之大，我们将予以重视。

Let’s talk about the problem of quantity.
我们谈谈数量的问题吧。

Let me introduce you to Mr. Li, general manager of our company.让我介绍你认识，这是我们的总经理，李先生。

It’s an honor to meet. 很荣幸认识你。