如果匹配上了，就用发送操作符(即！符号)向broker进程发送一则消息，告诉它下单。

If it finds a match, it USES the send operator (the! Symbol) to send a message to the broker process telling it to place an order.

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它源自于农夫午餐——这是一种古老的酒吧餐品，曾被提名为“英伦文化符号”，传统吃法是配上一杯啤酒。

It is derived from the Ploughman's Lunch, an old-fashioned pub meal that was nominated as a cultural icon of Britain and is traditionally accompanied by a glass of beer.

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