when you buy and sell a contract you are buying

当你买卖一个合同时你实际上
and selling with the exchange or the clearing house of the exchange.

在和市场或者说交易所进行买卖
You do not know the counter party;

你不认识对方买家或卖家
you do not know who's on the other side.

你不知道谁在另外一边和你交易
With a forward market, you know very well who's on the other side;

远期市场中你会非常清楚交易对方是谁
you're going to a warehouse and there's this warehouse

你去到一个仓库而买方
who's going to take your grain.

就在那里买走你的谷子
In the warehouse, you better trust the other side

在仓库里对方最好是值得信任的人
because suppose the other side doesn't work.

假设不是这样的话
Suppose you have your--you've loaded up all your rice

举个例子你已经把所有的米都装上车了
and you come to the warehouse and then the guy says,

到了仓库之后那个人和你说
I don't want to honor the contract.

我要毁约