work with the exchanges,

经纪人和自营商
but I want to go on to talk about

但是接下来
the exchanges themselves on which these people trade.

我想谈的是交易进行的场所
This is, unfortunately, a difficult topic to keep up with because

但是不幸我们的讨论赶不上变化
the exchanges are changing every year.

因为交易所年年有所不同
I think a big impetus for change is

我想促能改变的一大原因是
the advance of information technology.

信息技术的进步
I might say also, financial technology.

也因为金融技术的进步
This is a world in rapid change; it's not fixed at all.

这是一个不断发展从未停步世界
I wanted to just talk about

我想讲的是
different kinds of exchanges that we have.

我们拥有的各种不同的交易所
Traditionally, we say there are--in the U.S.,

传统上说在美国