When the people in charge of one product or product area want a service from a domain, they makes a request and the two groups determine the relationship, creating a service-level agreement.
当主管某个产品或产品领域的人希望从域获得服务时，他们生成一个请求并且两个组确定相互联系，创建服务层次协定。
A contract is a mutually binding agreement that obligates the Seller to provide the specified product or service or Result and obligates the Buyer to pay for it.
合同是对双方都有约束力的协议，它强制卖方提供规定的产品、服务或成果，强制买方支付相应的报酬。
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