but they standardized delivery dates and delivery locations.

还给交付日期和交付地点设立了标准
What would you trade in these futures markets?

那期货市场上都交易什么
You would be trading--

你可能会交易...
you'd either be buying or selling rice for future delivery

你可能会进行大米期货的买卖交易
on a standardized delivery date at a standardized location--

交割日期和地点都是特定的...
probably one of the warehouses that they designate.

可能是他们指定的仓库之一
That might not be the rice you want or the date you want and yet,

也许那不是你要的大米或你想交割的日期
somehow the market gets going and gets very big.

但市场就这样在无形中建立并扩大
This is the reason:

原因就是
what a futures market does

期货市场所做的
that's different from a warehouse market is

和仓库市场所做的不同之处在于
it sets up a standard price and a liquid market.

后者设定了一个标准价格和一个流动市场