All guests should advise hotel cashier upon departure and follow the agreed-upon procedure for payment.
所有客人在离开酒店前都必须根据协议程序付款并办理离店手续。
A procedure normally followed in a business situation, and which may carry as much moral and legal right and obligation as an agreed-upon procedure.
企业通常情况下遵守的规程，与一个约定规程一样，它规定了道义上的和法律上的权利和义务。
This is where the interface comes into picture which maintains all the procedure declarations and data types that client and server agreed upon.
这就是接口起的作用，接口维护客户机和服务器都认可的所有过程声明和数据类型。
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